单选题The rope which is the lightest is（）.AmanilaBnylonCpolypropyleneDdacron
单选题
The rope which is the lightest is（）.
A
manila
B
nylon
C
polypropylene
D
dacron
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Passage TwoThere was a big pile of bricks on the top of a tall building and a manhad to bring them down to the ground. He had a long rope which went over a pulley(滑轮) at the roof of the building. The other end was fastened to a big box.First he pulled the box up to the top of the building, and fastened the end of the rope so that thebox could not come down. Then he climbed up the ladder and filled the box with bricks. Nexthe climbed down the ladder and untied the rope. Unfortunately the box of bricks was heavier thanthe man, and as a result he was pulled up by the: rope. Half-way up, the box of bricks hit him as it was coming down.When he reached the top, his head hit the pulley. The box of bricks hit the ground and broke.As a result the bricks fell out. The box was then lighter than the man and consequently he beganto come down and the box began to go up.Half-way up, the box hit the man. The man still held on to the rope and the box therefore Continued togo up. The man then reached the ground. Then he let go the rope to rub his head. The box, ofcourse, then fell down and hit the man on the head again. As a result, an ambulance came and tookhim to hospital40. Why did the man fasten the end of the rope before he climbed up the ladder?A. He was afraid that someone would steal his box.B. Because he wanted to climb up along the rope.C. He fastened the end of the rope in order to keep the box unmoved.D. Because he wanted to prevent the box from coming down.
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