I 1620, about half the USA wa covered y forests． Today the forest have almost gone． A lot of
good land ha gone with them, leaving only and． China doe 't want to copy the USA' example
． We're lanting more and more trees． We've uilt the " Great Gree Wall" of tree acro
norther art of our country．
The Great Gree Wall i 7,000 kilometre long, and etwee 400 and 1,700 kilometre wide．
It will to the wind from lowing the earth away． It will to the and from moving toward the
rich farmland i the outh． More "Great Gree Walls" are eeded． Tree must e grow all ove
r the world． Great Gree Wall will make the world etter．

根据短文内容，选择正确答案。

1．I 1620, about ______ the USA wa covered y forests．

A．a third ．half C．two third D．a fourth

2．A lot of good land ha gone with ______．

A．sand ．water C．wind D．forests

3．The Great Gree Wall i China i ______ long．

A．7,000 kilometer ．1,700 kilometer

C．7,000 meter D．400 kilometers

4．Tree must e grow i ______.

A．China ．the USA

C．some countrie D．every art of the world

5．______ will make the world etter．

A．The Great Wall ．Tall uilding

C．Great Gree Wall D．Flower and gra

KEY: 1． 2．D 3．A 4．D 5．C