问题
单项选择题
飞机过载和载荷因数是同一概念（）
A.是
B.不是
C.不确定
答案
参考答案：A
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飞机过载和载荷因数是同一概念（）
A.是
B.不是
C.不确定
参考答案：A
1970 was the World Conservation(保护)Year. Everyone must know that the world is in danger. 16 is one example of the 17 .At one time there were 1,300 different kinds of trees and flowers in Holland(荷兰),but now only 866 remain(继续存在), 18 have been destroyed by modern man. We are changing the earth, the air and the water, and 19 that grows and lives. If we go on like this , we shall destroy ourselves. What will happen in the future? Perhaps 20 is more important to ask “What must we do now?” The people who will be living in the world tomorrow are 21 young of today. A lot of them know that conservation is necessary. Many are helping to save 22 . Now fifteen million young people in many countries are studying 23 and the country around him. In some countries they spend much time as “conservation volunteers.” They plant trees and help to 24 wild birds and animals. But everyone, 25 young people, must work to save our world.
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