题目内容

I like mathematics and physics because I think that ________ very important for me to make further research in this field.

A. what is
B. they are
C. this
D. which are

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A. are going to attend the meeting
B. have attended the meeting
C. has attended the meeting
D. is attended the meeting

A. 60 L/min
B. 600 L/min
C. 6×104 L/min
D. 1000 L/min

A. 下降
B. 增加
C. 没有变化
D. 不一定

A. 100余年
B. 150余年
C. 200余年
D. 250余年