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  3. (Some fish) have whiskers, which are sensory organs used (for touching) and tasting, and which (are helpful) when (are they) sea

(Some fish) have whiskers, which are sensory organs used (for touching) and tasting, and which (are helpful) when (are they) sea

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问题 (Some fish) have whiskers, which are sensory organs used (for touching) and tasting, and which (are helpful) when (are they) searching for food in sand and mud.
选项 A、Some fish
B、for touching
C、are helpful
D、are they
答案D
解析
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