给下面句中加横线的词语换个说法，使句子意思不变。   

1．在数千年到数万年前黄土高原乃至黄河流域，自然条件是很好的。    (         ) 

2．这样数管齐下，一定能防止水土流失。    (         ) 

3．它用尖嘴啄幼龟的头，企图把它拉到沙滩上去。    (         )  

4．森林面貌顿时改观了。    (         )

The teacher asked the children to write ________ line but Tom just wrote very carelessly ________ lines.[       ]

A. other every; few every

B. other every; every a few

C. every other; every few

D. every other; every a few