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Now they are ready to solve many problems of space travel, from guidance and____ to flight dynamics of missiles beyond the earth's atmosphere.(1分)
A
direction
B
instruction
C
technique
D
navigation
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试题答案：
D
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相关题目
24.4 According to the passage, which of the following is True?(2分)
______the next day, we would have climbed the mountain with her.(1分)
2.A.clear B.individual C.easy D.complex
24.The earliest process of making paper was done almost five thousand years ago in Egypt and the Nile Valley. In those days, paper was made from strips of the papyrus plant. Modern paper-making began in China about two thousand years ago. This process produced paper from cloth, straw, wood or the bark of trees. The raw materials are struck over and over until they become loose. Then they are mixed with water. After the water has been removed, the flat, thin form remaining is permitted to dry. This becomes a sheet of paper.Large machines started to be used for making paper near the end of the sixteenth century. Today, paper-making is a big business. But it is still possible to make paper by hand, since the steps are the same as using big machines.You should choose paper with small amounts of printing. Old envelopes are good for this reason. Colored paper also can be used, as well as small amounts of newspaper. Small pieces of rags or cloth can be added. These should be cut into pieces about five centimeters by five centimeters.Everything is placed in a container, covered with water and brought to a boil. It is mixed for about two hours with some common chemicals and then allowed to cool. Then it is left until most of the water dries up. The substance left, called pulp, can be stored until you are ready to make paper.When you are ready, the pulp is mixed with water again. Then the pulp is poured into a mold. The mold is made of small squares of wire that hold the shape and thickness of the paper. To help dry the paper, the mold lets the water flow through the small wire squares.After several more drying steps, the paper is carefully lifted back from the mold. It is now strong enough to be touched. The paper is smoothed and pressed to remove trapped air. You can use a common electric iron used for pressing clothes.(10分)24.1 According to this passage, the earliest paper was made by ______.(2分)A. Chinese peopleB. Roman peopleC. Indian peopleD. Egyptian people
To us it seems so natural to put up an umbrella to keep the water off when it rains, But actually the umbrella was not invented as protection against the rain, Its first use was as a shade against the sun!
24.2 These "new things” in Paragraph One mentioned by the author are actually .(2分)
He makes a good living____ selling used car.
—Cinderella has been learning Chinese in Beijing University for the past four years. —No wonder she __________ above her colleagues in Chinese.(1分)
24.5 Which of the following is not a matter for civil case?
The drinking water is____ before we drink it.
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