单项选择题

There are various ways to solve the problem.()

A. same
B. many
C. helpful
D. different

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单项选择题
Techniques to harness the energy of the sun are being developed.()

A. convert
B. store
C. utilise
D. receive
单项选择题
The city has decided to do away with all the old buildings in its centre.()

A. get rid of
B. set up
C. repair
D. paint
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