The People’s Republic of China was founded on( ) 1949.

1( ) , Mother will wait for him to have dinner together.

2 But with your help，we may be able to reserve the trends which threaten our very existence. 译文：_____

3 The trouble with deserts is that they tend to creep outwards on to the fertile soils. 译文：_________

4 At the same time we are using up our natural resources—fuels and mineral ores—at an ever-increasi

5 He has done this by his ignorance，his greed，his wastefulness. 译文：______________

6 Ecology is the science of how living creatures and plants exist together and depend on each other a

7 不断增长的人口已成为地球的一个沉重负担。(increase) 译文：______________

8 由于森林的破坏，大片的良田正在变成荒漠。(turn to) 译文：______________

9 作为生态环境的一部分，人类对自然环境的破坏无异于是在毁灭自己。(damage) 译文：______________

10 生态平衡一旦被破坏，就会引起不可想象的严重后果。(upset) 译文：______________