已知1＜x＜3，化简|x-3|+|x-1|等于（） A．2x B．-2 C．2

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问题选择题

已知1＜x＜3，化简|x-3|+|x-1|等于（　　）

A．2x

B．-2

C．2

D．-2x

答案

∵1＜x＜3，

∴x-3＜0，x-1＞0，

则原式=3-x+x-1=2．

故选C．

选择题

— I am worried I can't get into a good high school because I'm weak ______ English.

— Don't worry. ______ and asking a teacher for help can help a lot. [ ]

A. in; Work hard

B. in; Working hard

C. at; Working hard

D. at; To work hard

填空题

随着干燥过程的进行，生球的（）将发生收缩。