I wanted to make the baby stop ______,So

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问题选择题

I wanted to make the baby stop ______,So I made faces. Then he stopped______at me with a big

smile. [ ]

A. to cry; to look

B. to cry ; looking

C. crying; looking

D crying; to look

答案

答案：D

选择题

The employees were asked to concentrate their attention________improving the quality of the products.[ ]

A. in

B. to

C. with

D. on

单项选择题

该试验的灵敏度是

A．90%
B．30%
C．25%
D．12%
E．10%