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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】13. What does the word “marsupials” refer to?
(A) Koalas.
(B) Eucalyptus.
(C) Zoologists.
(D) Acacias.


答案:A
難度: 簡單
1F
Savior Chu 國二下 (2015/05/22)
marsupial 有袋動物 eucalyptus 尤加利樹 acacia 洋槐/阿拉伯橡樹
2F
112年已上岸,再接再厲 博二下 (2022/06/15)

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. 

熱衷於解開有袋動物秘密的動物學家團隊在 2009 年和 2010-11 年期間在澳大利亞東南部的冬季和夏季觀察了 37 隻野生無尾熊。

“有袋動物”這個詞指的是什麼?

(A) 無尾熊。

(B) 桉樹。

(C) 動物學家。

(D) 相思樹屬,金合歡屬。

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