2. 外语
  3. People often laugh when they see penguins walking. Penguins look very funny waddle from side to side on their short little legs.

People often laugh when they see penguins walking. Penguins look very funny waddle from side to side on their short little legs.

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问题 People often laugh when they see penguins walking. Penguins look very funny
waddle from side to side on their short little legs. However, Adelie penguins 【M1】______
can walk 200 kilometers across the Antarctic sea ice to the place they lay 【M2】______
their eggs.
Penguins are such good swimmers so early explorers thought they were 【M3】______
fish. They use their flippers ’fly’ through the water as other birds use their 【M4】______
wings to fly through the air. Emperor penguins, the big penguins, 【M5】______
can go as fast as 50 kilometers an hour. If Adelie penguin is swimming 【M6】______
quickly, it can jump 2 meters out of the water. They do this before they are 【M7】______
being chased by leopard seals, which like to eat them.
Emperor penguins can hold its breath underwater for twenty minutes. 【M8】______
This means they can dive very deep to hunt for food. The deepest dive scientists
know about is 458 meters. That’s nearly half a kilometer!
When the male emperor penguins are looking after eggs, they join
together in tightly groups. In the middle of the group it might be 38℃ , 【M9】______
while on the outside of the group it might be -35℃. When the penguins 【M10】______
on the outside get too cold, they move slowly to the inside and others take
their place on the outside.
【M7】
选项
答案before→when
解析 (根据句意可知此处意为“它们在被豹形海豹追捕时会这样做”，因此应该用when。)
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本试题收录于： C类竞赛（非英语专业本科）题库大学生英语竞赛（NECCS）分类
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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