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第1题

Solar ovens consist _____ a system of reflectors and a cooking pot.

A、in
B、of
C、with
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第2题

Would you mind _______ your radio a little, please?

A、turn down
B、to turn down
C、turning down
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第3题

Mathematics ________the study or science of numbers..

A、is
B、are
C、was
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第4题

Building a house costs quite a lot of money. Suppose you plan to build a house. Your first step will be to find a right
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