John knowledge of radio just by staying around the radio station. A. caught on B. worked up C. took up D. picked up 题目和参考答案——青夏教育精英家教网—

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John _____ knowledge of radio just by staying around the radio station.

A. caught on B. worked up C. took up D. picked up

解析:

pick up学到，习得。

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Lying in the sun on a rock, the cougar （美洲狮） saw Jeb and his son, Tom, before they saw it. Jeb put his bag down quickly and pulled his jacket open with both hands, making himself look big to the cougar. It worked. The cougar hesitated, ready to attack Jeb, but ready to forget the whole thing, too.

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C. By throwing himself on the cougar. D. By swinging his fists at the cougar’s eyes.

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C. Jeb asked Tom to get the knife. D. Jeb held Tom across his body.