There are six ________ people in the world．

A. billions of B. billion of

C. billion D. billions

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When the sun goes down and the sky turns dark， people go back home．For them，this is the end of the day． But this is not the end of the day for some people．For them，work is just starting because they are night workers．When almost all people are sleeping， night workers are working hard．．

Betty's sister is a nurse．She works in a large hospital．Every month she works at night for ten days．She starts to work at 9o'clock in the evening and finishes it at 6o'clock in the morning． She says，"I have lunch between two and three o'clock in the morning．" Andy's uncle works at the fire station（消防局）at night．Tonight he may drive to a house to put out a fire．

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Night workers finish their work when the sun comes up．On their way home，they meet the day workers who are just starting their work．We must remember that there are many night workers around us．They work hard when we sleep．

1.This passage is about ．

A. all kinds of jobs

B. nurses and policemen

C. policemen and newspapermen

D. people who work at night

2.Night workers start their work ．

A. when the sun comes up

B. when they day workers finish their work

C. when the day workers fall asleep

D. at 9：00in the morning

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A. every night

B. at a fire station

C. ten days a month as a night worker

D. for twelve hours at night

4."to put out a fire" in the second paragraph means ．

A. to stop a fire from burning

B. to move a fire to another place

C. to look at a fire

D. to make a fire

5.Which of the following is not true？

A. Some nurses are night workers．

B. Many newspapermen work at night．

C. Many guards work at night．

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The list of riches of the sea to be developed by man's technology is amazing. Oil and gas explorations have been carried out for nearly 30 years. Valuable minerals on the ocean floor are ready to be mined(開采).

Fish farming promises to be a good way to produce plenty of food. The culture of fish and shellfish is an ancient skill practiced in the past mainly by eastern people.

Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature of the ocean can be used in a way similar to the steam(蒸汽) in a steamship. Ocean waves offer possible use as a source of energy.

Technology allows man to explore more deeply under the sea. The development of strong, new materials has made this possible.

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