單項(xiàng)選擇題Silk（）by Chinese for thousands of years now.

A.has been used
B.was used
C.is used


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1.單項(xiàng)選擇題he patient acted on the doctor's （）and finallyrecovered.

A.advices
B.advise
C.advice

2.單項(xiàng)選擇題Let me（）the case carefully before I draw a conclusion.

A.look out
B.look into
C.look after

3.單項(xiàng)選擇題More and more people in China now（）to work regularly.

A.drive
B.drives
C.have driven

4.單項(xiàng)選擇題The sun heats the earth,（）is very important to living things.

A.that
B.what
C.which

5.單項(xiàng)選擇題All the team members tried their best. We lost the game,（）

A.as
B.therefore
C.however