Li hardly spoke a word of English when she first arrived in the USA four years ago.译文:四年前,李刚刚来到英国的时候认识了不止一个单词。
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假如你让他待在你家, 你就是在自找麻烦。译文:If you let him stay at your home, you are asking for trouble.
A. 对
B. 错
After rain comes fair weather. 雨过天晴
A. 对
B. 错
阈上刺激作用于单根神经纤维时,刺激强度增加一倍,动作电位的幅度( )
A. 增加一倍
B. 减少一倍
C. 增加两倍
D. 不变