2. 外语
  3. Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sent

Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sent

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问题 Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warming at the approach of danger, and scouting outside the cave for new food and roosting site.
选项 A、acting as sentinels and to sound
B、acting as sentinels and sounding
C、to act as sentinels and sound
D、to act as sentinels and to sound
E、to act as a sentinel sounding
答案B
解析 本题是由such as引出的一组动名词短语并列。需要指出的是，在本题中，acting和sounding这两个动作之所以用and连接，作大并列结构中的一个小并列，是因为两者关系比较紧密。
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