单项选择题

The scientists began to accumulate a huge mass of data.()

A.build up
B. put up
C. make up
D. clear up

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单项选择题
The chemical is deadly to rats but safe to cattle.()

A. fatal
B. hateful
C. good
D. useful
单项选择题
These programmes are of immense value to old people.()

A. natural
B. fatal
C. tiny
D. enormous
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