of the tubes jumped out of the fire instead of exploding in it. • 7. Today rockets are very advanced machines which we can use to send astronauts into space. • 8. Soon the Mongols learned how to make rockets themselves and it is possible that they introduced them to Europe. • 9. Rockets were probably invented by accident about 2,000 years ago. • 10. But not everybody wanted to use rockets in battles.
• B4M4 翻译答案： • 1. He thought that the key to feeding people was to have more rice and to produce it more quickly. • 2.First Yuan Longping experimented with different types of rice. • 3. The results of his experiments were published in China in 1966. • 4. Researchers were brought in from all over China to develop the new system. • 5. As a result of Yuan Longping's discoveries Chinese rice production rose by 47.5 percent in the 1990's.
• B3M4 作文参考： • We human beings have caused great damage to our environment, which has a bad effect on our existence.More and more people have realized this problem and complain about it.Therefore, protecting the environment has become a major concern of the society. • As far as I am concerned, for our future we can do nothing but protect our environment.It is urgent to raise people’s awareness of environmental protection.And it’s every citizen’s duty to work hard to win the campaign of protecting the environment. •