2. 外语
  3. By using their trunks, elephants can tell the shape of all object and ______ is rough or smooth, or hot or cold.

By using their trunks, elephants can tell the shape of all object and ______ is rough or smooth, or hot or cold.

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问题 By using their trunks, elephants can tell the shape of all object and ______ is rough or smooth, or hot or cold.
选项 A、it
B、whether it
C、how
D、since it
答案B
解析
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