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【单选题】
已知函数 的图像为 上的一条连续不断的曲线，当 时， ，则关于 的函数 的零点的个数为（ ）A.
0
B.
1
C.
2
D.
0或2
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【简答题】根据短文，下列对硫酸铁对海洋作用的说法，不正确的是（ ）。
【简答题】简述都有哪些握拍方法?
【多选题】which of the following sentences are right versions for the Chinese sentence:我恐怕不能答应去参加今年的年会。( )
A.
I can’t take part in this year’s annual meeting.
B.
I am sorry I would not be able to attend the annual meeting this year.
C.
I would like to join this year’s annual conference, but I am afraid I couldn’t.
D.
No right response here.
【多选题】我恐怕不能答应去参加今年的年会。Which English sentences are polite in social life?
A.
I can’t take part in this year’s annual meeting.
B.
I am sorry I would not be able to attend the annual meeting this year.
C.
I would like to join this year’s annual conference, but I am afraid I couldn’t.
D.
None of above
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