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第三篇： Australia’s cuddly koala rarely drinks water and doesn't have any sweat glands, long leaving scientists to wonder how it cools off in a heatwave. On Wednesday, zoologists announced they had uncovered the iconic mammal’s secret—hugging trees, whose trunks can be several degrees cooler than the surroundings. Koalas have high mortality rates in heatwaves. Unable to sweat, they use panting as a way of evaporative cooling, but in the wild, they rarely drink and when they need to, water is often scarce. As tree-dwellers, koalas don't generally seek out cool, shadowy ground surfaces like many other animals. Keen to unlock the marsupials' secret, a team of zoologists observed 37 koalas in the wild during winter and summer seasons in southeastern Australia in 2009 and 2010-11. On hotter days, they found, the animals were more frequently positioned with all their limbs outstretched so they appeared to be hugging the tree trunk or lower branches. The warmer it got, the lower the marsupials were found in the trees, and more often in trees other than eucalyptus, their food source. This could be explained by the eucalyptus being only about 1.46-1.87 degrees Celsius cooler than air temperature, compared to about 5.0 C for the acacia. Based on their observations of tree temperature and koala behavior, the team concluded the animals lose “substantial” body heat to tree trunks in hot weather. Water savings from this behavior could be critical for the survival of this species during heatwaves when water availability is limited.
【題組】12. Which of the following is the most effective way for koalas to cool off in a heatwave?
(A) Drinking water.
(B) Sweating a lot.
(C) Getting more sleep.
(D) Hugging trees.

答案：D
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業精於勤，事立於豫 研一下 (2017/05/17)
以下哪一個是無尾熊在酷暑中降溫最有效方法...


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112年已上岸，擺脫爛上司 博二下 (2022/06/15)

On hotter days, they found, the animals were more frequently positioned with all their limbs outstretched so they appeared to be hugging the tree trunk or lower branches. 

他們發現，在炎熱的日子裡，這些動物更頻繁地四肢伸展，因此它們似乎在擁抱樹幹或較低的樹枝。

以下哪項是無尾熊在熱浪中降溫的最有效方法？

(A) 喝水。

(B) 大量出汗。

(C) 獲得更多睡眠。

(D) 擁抱樹木。

koala                n. （澳洲產）無尾熊；樹袋熊


第三篇： Australia’s cuddly koala rarely dr..-阿摩線上測驗