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	<question>
		<phrase isaudiomp3="1" mp3="AUDIO_REPOS/1.0.mp3"></phrase>
		<question isaudiomp3="1" rationale="0" picture="images/question1.jpg" mp3="AUDIO_REPOS/920-1" exercise_type="" questionmode="" choicemode="" answerbankid="" answerbankmode="" rationalemode="" playonload="" mp3speed="" ttsspeed="" passage="1" show_passage="" show_passage_audioplayer="" passage_audio_type="" showvideo="" video="" enable_audio_recorder="" recorder_mode=""><![CDATA[]]></question>
		<saythis><![CDATA[]]></saythis>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Trees provide koalas with more than food and shelter  -  they also serve as air conditioners, scientists say.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[On a hot day in Australia, a koala's thick fur is not necessarily an asset.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The marsupials don't retreat to dens or dugouts, and the water that would help them cool off can be hard to come by.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[In the wild, the animals "can suffer high mortality during extreme heat events," according to a report published Wednesday in the journal Biology Letters.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The authors of the study figured koalas must do something to cool off in hot weather.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[To figure out what it was, they put radio collars on 37 koalas in southeastern Australia and tracked their movements during the winter of 2009 and the summer of 2010-11. (In the land Down Under, summer lasts from December to March.)The researchers kept detailed records of these koalas' activities, noting their posture and their preferences for high or low branches.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The scientists also used a portable weather station to assess the microclimate conditions just a couple of feet from where the koalas made themselves comfortable.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[For additional data, the scientists observed another 130 koalas in the area that weren't wearing collars.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[What they discovered was that the koalas' posture on hot days was quite different than on cooler days.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[In the summer, the animals arrayed themselves in trees in a way that exposed more of their surface area.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[This often meant hugging a tree trunk or a large branch closer to the ground, with arms and legs outstretched.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[In the winter, koalas ventured higher up in the tree and farther out onto the branches.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[To answer this question, the researchers took the temperatures of four species of trees  -  three eucalyptus and one acacia  -  at the peak of summer.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Using a thermal-imaging camera and software, they discovered that the tree trunks had lower surface temperatures than the branches or canopies.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[The trunks were also cooler than the surrounding air.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[This seemed to explain why koalas stayed closer to the base of the tree in the summer and ventured farther up the tree in winter.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Of all the trees tested, the coolest ones were the Acacia mearnsii trees, the scientists found.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[As it happens, these were the trees where koalas spent 29 percent of their time in the summer but only 5 percent of their time in the winter.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Koalas can't eat the leaves of these trees, but now scientists believe they know why they're so appealing, especially in the summer months.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[To make sure that their trees-as-air-conditioners theory was plausible, they came up with an equation to determine just how much heat a koala could dissipate by hugging a cool tree.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[After taking into account the thickness of a koala's compressed fur, the thermal conductivity of that fur and the surface area of the fur touching a tree (among other factors), they calculated that a 25-pound male koala could shed 68 percent of its excess heat on a 95-degree day by hugging a cool tree in a shady spot.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[That, in turn, could mean the difference between life and death when water was scarce.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[It's an ingenious strategy for chilling out, and koalas probably aren't the only animals that realize it, the researchers wrote.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA["Cool tree trunks are likely to provide important microhabitat for a broad range of tree-dwelling species, including primates, leopards, birds and invertebrates during hot weather," they wrote.]]></answer>
		<answer isaudiomp3="1" picture="images/c1.jpg" mp3="AUDIO_REPOS/920-1" isrationalemp3="1" rationalemp3="AUDIO_REPOS/right.mp3" rationaleimage="images/rationale/1.1.jpg" rationale="Right" value="1" choicesay=""><![CDATA[Knowing this will help humans predict how animals will adapt to a warming climate, as well as help them decide what kinds of habitat are most critical to preserve, the researchers added.]]></answer>
		
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