单项选择题

Freezing is at present one of the ()of preserving meat, fruit and Vegetables.

A. most methods important
B. methods most important
C. most important methods
D. important most methods

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单项选择题
At the meeting both sides exchanged their views on a wide () of topics they were interested in.

A.extent 
B.number 
C.collection 
D.range
单项选择题
--Have you moved into the new house--Not, yet. The rooms ()now.

A. were painted           
B. have painted
C. are being painted         
D. are painting
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