10000 years ago, the world's popuplation was very( 1 ).For several thosand years,it grew quite( 2 ).But during the last three or four hundred years,it ( 3 )very quickly Today,it is still growing faster than ever before.China has the largest population in the world.The babies born in one year are almost as many as the population of Australia This means we must grow more food {and have smaller familes with fewer but ( 4 ) children.解释这句话！我看不懂 } 后面省略
1.A large B big C small D little
2.A slow B fast C quickly D slowly
3.A is growing B has grown C grew D will grow
4.A fatter B healther C healthier D thiner
重点 解释一下！第1 第4

1.C 人口的多少用large /small
2.D 从上下文理解是这个时间人口增长慢，用副词slowly。
3.B 这里是时间段，而且对现在有影响，用现在完成式。
4.C healthy健康的，比较及是 healthier。理解上下文是，每年出生的孩子差不多是澳大利亚的总人口，这表明我们必须生产更多的食物并且减少家庭数量，有更少但是更健康的孩子。