21听材料，回答下列问题：A. The windows.B. The front door.C. The living room.D. The back door.

　　本题共7.1分，参考答案:A解析:

　　22A. Having doom with glass in them.B. Having a good quality lock.C. Hiring a strong gatekeeper.D. Having a good neighbor,

　　本题共7.1分，参考答案:B解析:

　　23A. Leave all the things to your neighbor to look after.B. Tell the post office to keep the mail until you come back.C. Cancel the delivery during the time you are not at home.D. Make sure there will be always someone in the house.

　　本题共7.1分，参考答案:C解析:

　　24听材料，回答下列问题：A. They are highly intelligent animals.B. They are too huge to measure.C. They are blue and difficult to see.D. They can move in three dimensions freely..

　　本题共7.1分，参考答案:B解析:

　　25A. They look true blue underwater.B. They look blue on the surface.C. They have blue underbellies.D. They have blue microorganisms.

　　本题共7.1分，参考答案:A解析:

　　26A. They can emit a series of pulses, groans, and moans.B. They can cruise the ocean at more than 20 miles an hour.C. They can navigate the lightless ocean depths.D. They can swim very fast and have excellent hearing.本题共7.1分，参考答案:A解析:

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