题目内容

Mike taught_____ maths when he was a child.

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We learn English over the radio_____ .

Help _____ tosomemeat , Alice .

We express _____ by using words and body language.

2.不能通过简单扩散进出细胞膜的物质是______。

A. O2
B. N2
C. 乙醇
D. 甘油
E. Na+、K+