大学英语四级改错练习题及答案四

会计考友

Only a generation ago, Mauritania's capital city was
, y2 |9 `) M! q6 L. n3 h% Emany day's walk from the Sahara. Today it is in the Sahara. 1.__________
The sand blows through the city streets and piles up in 2.__________
) m! P0 j: H4 x5 swalls and fences. The desert stretches out as far as the
eye can see.

- U0 ^+ c. ?- o3 Y* F! GIn some parts of the Amazon rain forest in Brazil, all
& i  K' q% j! x: \the trees have cut down. The earth lies bare and dry in the 3.__________
0 Z5 ?- M9 u' o7 I, h4 @- yhot sun. Nothing grow there anymore. 4.__________
5 E$ d7 x% y: F( z1 H5 G
/ K7 h, _3 U+ u% W2 R; T' aOver vast areas of every continent, the rainfall and
1 }3 B8 ]! C1 w0 s) ?( }! Zvegetation necessary for life is disappearing. Already 5.__________
more than 40 percent of the earth's land is desert and 6.__________
9 V& T7 D8 f+ h. Ddesert-like. About 628 million people--one out of seven--
live in these dry regions. In the past, they have managed to
survive, but in difficulty. Now, largely through problems 7.__________
6 H' m5 D  ^3 n2 V. q2 k. G& wcaused by modern life, our existence is threatened by the 8.__________
. Z$ z2 o0 v; uslow, steady spread of the earth's deserts.

  T3 Q5 U6 M; QMany countries first became concerned in 1970s after 9.__________
) |8 \6 X& F8 [a terrible drought and famine destroyed Africa's Sahel,
the fragile desert along the south edge of the Sahara.
Thousands of people died even though there was a worldwide
1 i& n/ f+ j- u5 |0 a& N7 zeffort to send food and medicine to the starved people. 10.__________
) J, a: k; p8 Y8 l) L
# h' S) u3 h# N3 G  M  [参考答案
1. day's → days'
2. in → against
3. have ∧ cut → been
) c1 A/ G& ]  V! l4. grow → grows
5. is → are
6. and → or
2 ?( Z8 f( \7 H" U9 t$ n7. in → with
8. our → their
1 }9 V* H2 Q' H' l/ f5 m3 ~% x9. in ∧ 1970s → the
0 J) E3 p% d; J10. starved → starving