The group of boys had to stop because ______. The helicopter could not land because ______.

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问题 The group of boys had to stop because ______.
The helicopter could not land because ______.

选项 A、the mountain was too high
B、the mountain sides were too steep
C、the runway was too narrow
D、the weather was very bad

答案B

解析 由文章“The helicopter soon arrived on the scene,...,the slope was too steep even for that”一句可知飞机不能降落的原因是地势险峻。
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