土酸是由（）合成的酸。A.盐酸和氢氟酸 B.硫酸和盐酸 C.硝酸和

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问题单项选择题

土酸是由（）合成的酸。

A.盐酸和氢氟酸

B.硫酸和盐酸

C.硝酸和氢氟酸

D.硝酸和硫酸

答案

参考答案：A

选择题

— Have you heard what Mary asked me?

— Yes. She asked _____. [ ]

A. whether I have got the ticket for the 2012 Olympic Games

B. whether you had got the ticket for the 2012 Olympic Games

C. that I have got the ticket for the 2012 Olympic Games

D. had you got the ticket for the 2012 Olympic Games

填空题

齿状线是____与____的交界线。