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I'm looking forward to ___________one—month trip in Africa soon.

A.a B.an C.the D./

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The Garbage (垃圾) Project started at the University of Arizona in 1973. Since then, the students and teachers in it have studied the modern garbage in different cities.

To study the garbage, the students had to travel to landfills (填埋場) , the places where cities bury (填埋) their garbage. While the students were studying the garbage they wore special clothes. Students were very careful when they opened bags of garbage.

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A.1973 B.1970 C.1948 D.1940

2.To study the modern garbage, the students had to do many things except ____________.

A.Wearing special clothes B.traveling to landfills

C.burying the garbage themselves D.opening bags of garbage

3.The underlined words "dispose of" in Paragraph 4 means ___________.

A.crash into B.deal with C.worry about D.put up

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B.isn't harmful garbage

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D.never pollutes the environment

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B.Scientists thought about 70 % of the garbage in landfills would disappear slowly.

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Read the passage and choose the best answer.

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1.Why are they called hummingbirds?

A.They are very light. B.They sing when they fly.

C.Their wings make a humming sound. D.Their song sounds like humming.

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B.They chew up flower petals(花瓣) with their beaks.

C.They use their heads and bills to eat pollen.

D.They lap up nectar with their tongues.

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C.They bring pollen from one flower to the next. D.They plant seeds.

5.Which title best describes the main idea of this text?

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