题目内容

The problem of global warming___for decades.

A. has been existed
B. has existing
C. being existed
D. has existed

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Let everybody___something to reduce environmental pollution.

A. do
B. to do
C. doing
D. do it

Turn on the television or open a magazine, and you___advertisements advocating reducing carbon footprints.

A. will often see
B. often see
C. are often seeing
D. have often seen

If the lights were on, they___have been at home.

A. must
B. need
C. shall
D. would

室内噪声的测定：用声级计测定，其测定点以房间中心离地面高度()m处。

A. 0.5
B. 0.8
C. 1.0
D. 1.2