2014年大学英语四级改错练习9

　　Only a generation ago, Mauritania's capital city was

　　many 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.__________

　　walls and fences. The desert stretches out as far as the

　　eye can see.

　　In some parts of the Amazon rain forest in brazil, all

　　the trees have cut down. The earth lies bare and dry in the 3.__________

　　hot sun. Nothing grow there anymore. 4.__________

　　Over vast areas of every continent, the rainfall and

　　vegetation necessary for life is disappearing. Already 5.__________

　　more than 40 percent of the earth's land is desert and 6.__________

　　desert-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.__________

　　caused by modern life, our existence is threatened by the 8.__________

　　slow, steady spread of the earth's deserts.

　　Many countries first became concerned in 1970s after 9.__________

　　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

　　effort to send food and medicine to the starved people. 10.__________

　　参考答案

　　1. day's → days'

　　2. in → against

　　3. have ∧ cut → been

　　4. grow → grows

　　5. is → are

　　6. and → or

　　7. in → with

　　8. our → their

　　9. in ∧ 1970s → the