10.There are many people in the world now.There will be a lot more people next century.So the earth will be very crowded and there will be a little room for each person.Maybe there will be only standing room on the earth in 600years.That will be a very serious problem.
So man is coming up with a way to solve the problem.
The moon is the satellite(卫星) of the earth.Man will probably go to live there some day.But there is no air,no plants,and no life on the moon.So scientists are doing all kinds of experiments.They have to solve many problems till man can live on the moon.Our dream will come true one day,we all think.
任务一:回答问题.
76.In how many years will there be only standing room on the earth?In 600 years.
77.What should scientists do if we want to live on the moon?They should do all kinds of experiments to solve many problems.
任务二:句型转换.
78.The moon is the satellite of the earth.(对划线部分提问)What is the satellite of the earth?
79.So man is coming up with a way to solve the problem.(改为同义句)
So man isthinking of a way to solve the problem.
80.Our dream will come true one day,we all think.(改为宾语从句)We all think that our dream will come true one day..