A.is full of
B.are full of
C.is full with
D.are full with
第1题
M: Wall, he is full of praise when you train yourself hard, but when you get up later than five o'clock in the morning, you'd better watch out.
Q: How does the new coach treat his men?
(17)
A.He looks after them carefully.
B.He does not like Mr. Smith and his friends.
C.He is very strict.
D.He makes them work even in the early morning.
第2题
第3题
W: On the whole, it is true. But you can't miss the point that it is more competitive.
Q: What is the woman's response to the mans re mark?
(18)
A.She partially agrees with the man.
B.She completely agrees with the man.
C.She doesn't agree with the man.
D.She thinks life's worse for young people.
第4题
第5题
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
The gravitational pull of the earth and moon is important to us as we attempt to conquer more and more of outer space. Here's why.
As a rocket leaves the earth, the pull of the earth on it becomes less and less as the rocket roars out into space. If you imagine a line between the earth and the moon, there's a point somewhere along that line, nearer to the moon than to the earth, at which the gravitational pull of both the earth and the moon on an object is just about equal. An object placed on the moon side of that point would be drawn to the moon. An object placed on the earth side of that point would be drawn to the earth. Therefore, a rocket need be sent only to this "point of no return" in order to get it to the moon. The moon's gravity will pull it the rest of the way.
The return trip of the rocket to the earth is, in some ways, less of a problem. The earth's gravitational field reaches far closer to the moon than does the moon's to earth. Thus, it will be necessary to fire an earthbound rocket only a few thousand miles away from the moon to reach a point where the rocket will drift to earth under the earth's gravitational pull.
The problem of rocket travel is not so much concerned with getting the rocket into space as it is with guiding the rocket after it leaves the earth's surface. Remember that the moon is constantly circling the earth. A rocket fired at the moon and continuing in the direction in which it was fired would miss the moon by a wide: margin and. perhaps continue to drift out into space until "captured" in another planet's gravitational field. To reach the moon, a rocket must be tired toward the point where the moon will be when the rocket has traveled the: required distance. This requires precise calculations of the speed and direction of the rocket and of the speed and direction of the moon.
For a rocket to arrive at a point where the moon's gravity will pull it the rest of the way, it must reach a speed called the velocity of escape. This speed is about 25, 000 m/les (about 40,200 kilometers) per hour. At a speed less than this, a rocket will merely circle the earth in an orbit and eventually fall back to the earth.
This short passage is mainly about ______.
A.the rocket
B.the pull of the earth
C.the pull of the moon
D.the gravitational pull of the earth and moon
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