成语和短语

答案： B

解释: Perplexed (困惑的) means completely baffled (完全困惑), 例如, Jack was at his wit's end to find that his car was stolen (杰克发现他的车被偷了，束手无策).。

答案：C

解释: She has knowledge of all sports at her fingertips (她对所有运动都了如指掌).。

答案： A

解释: Jack is the only boy in his family, so he is all in all in his home (杰克是他家唯一的男孩，所以他在家里很重要).。

答案：C

解释: All books were in an apple-pie order in his study room (他书房里的所有书都井井有条).。

答案： A

解释: Peter was very weak but after joining the gym he became as fit as a fiddle (彼得以前很虚弱，但在加入健身房后变得非常健康).。