2.It takes the earth ______ to turn around its axis once.

　A. a week B. a month C. 12 hours D. 24 hours

1.The meaning of “a make-believe line” is “a line that ______”.

　A. is called pole B. we can’t see

　C. anyone can see D. we can make and believe

5.Choose the best title fro the passage.

　A.An Earthquake B. A Scientist and an Earthquake

　C. How to Fight Against Earthquake D. Earthquakes Today and Tomorrow

　Passage 7

　It seems to us that the earth stands quite still (静止的). But it is really moving all the time. It turns around a make-believe line through its center. We call this make-believe line the earth’s axis (地轴). The two ends of the earth’s axis are called its poles (极). The earth travels twenty-four hours around its axis once.

　We look at the sun and say it “travels” across the sky, but the sun doesn’t really do so. The turning of the earth makes us feel as if the sun were moving across the sky. We can’t see that the earth is moving because everything else on the earth is turning with us. As the earth turns around every twenty-four hours, first one half faces the sun and then the other half. When our half of the earth is facing the sun, we say it is “day”. When our half is away from the sun, we say it is “night”. It is the turning of the earth that tells us when to go to bed and when to get up.

4.In the future we’ll be no longer so afraid of earthquakes ______.

　A.with the help of scientists’ exact prediction (预报)

　B.because of a map showing the “earthquake belts”

　C.because we can guess the date and place of earthquakes

　D.as scientists know what to do and how to do it

3.A map showing the earthquake belts will tell people ______.

　A.what kind of houses to build

　B.what kind of houses can stay up in an earthquake

　C.where earthquake may happen

　D.how to keep themselves safe during an earthquake

2.The reason for an earthquake is _______.

　A.the result of rock plate sudden movement

　B.that there are so many plates on the earth

　C.that the sea is too deep

　D.rocks’ cracking open

1.A large number of earthquakes often happens ________.

　A. in the area B. on land C. at night D. next to mountains

5.From the story we learn that ___________.

　A.small workers can’t do big things

　B.only big workers can do big things

　C.small workers can do big things if they work hard work and work a long time

　D.all small things can do big things

　Passage 6

　When some plates of the earth move suddenly, an earthquake happens. Many earthquakes begin under the sea. Earthquakes may happen anywhere on the earth. They often happen near the mountains.

　During an earthquake, the shakings make rocks rise suddenly and even crack (断裂) open. Houses fall, people are killed or hurt, and sometimes the whole villages or cities are destroyed.

　Can we do something to keep ourselves safe from earthquakes? Scientists have studied earthquakes and make maps that show the “earthquake belts”. In areas (地区) in these belts, it’s possible for earthquakes to happen. In these areas we should build strong houses to fight against earthquakes.

　In the future, scientists will be able to tell when and where an earthquake will be before they happen. They can also tell people what to do and how to do it.

4.How did seeds of trees, grass and flowers come to the coral islands? ________

　A.The wind and birds brought them to the coral islands

　B.Only the wind brought them there

　C.People brought them there

　D.Fishes brought them there

3.There are _______ in the holes in corals.

　A. flowers B. little corals C. grass D. sea animals