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  The sounds we hear on the earth are carried by the air. Since there is no air on the moon, people who get to the moon must talk to each other by radio. The dust(灰尘)in the earth's air, though very little, scatters(散射)he sunlight. This makes the earth's daytime sky blue and the shadows(阴影)are not completely dark. But on the moon, the sky is always black. You would be able to see stars in the daytime. Sunny places on the moon would be very, very bright. But the shadows would be almost black. The moon has no air or wind to carry the sun's heat. So it can get hot enough to boil(煮开)water in the places where the sun is shining straight down.

(1) In the daytime the sky was ________ on the moon.

[  ]

Avery, very bright

Bblue

Csometimes dark

Dalways black

(2) All the sunny parts of the moon are ________ those of the earth.

[  ]

Anot brighter than

Bas bright as

Cbrighter than

Ddarker than

(3) The earth's sky looks blue because ________ .

[  ]

Athe air around is a blue gas

Bthere is dust on the earth

Cof the fact that the sunlight is blue

Dthere is air around and the dust in the air scatters the sunlight

(4) Which of the following is not true?

[  ]

AThe shadows on the moon would be nearly black.

BAll the sunny places of the moon can become so hot as to boil water.

CThe moon has no air and no wind.

DEven in the daytimes stars could be seen on the moon.

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