英语四级改错精练(3)

英语四级改错精练(3),标签：四级完形填空真题答案,四级完形填空练习技巧,http://www.xuehuiba.com
　and to propose the most changes to patents. In all 8.__________
　instances, he found a spring peak and an autumn peak
　separated by a summer low. On other hand, Professor 9.__________
　huntinton's studies indicated that June is the peak
　month for suicides and admissions in mental hospitals. 10.__________
　June is also a peak month for marriages!

　参考答案　

　1. before → ago
　2. surprised → surprising
　3. does → do
　4. however → moreover
　5. being → be
　6. an → any
　7. apparent → apparently
　8. to(1) → /
　9. On ∧ other → the
　10. in → to

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　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

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　Jungle country is not friently to man, but it is
　possible to survive there. You must have the right equipment
　and you must know a lot important things about 1.__________
　woodcraft(森林知识). Then your choices of staying living 2.__________
　are very good.

　No one should go into the jungle without the right
　equipment. You need lightweight clothings, a good sheath 3.__________
　knife or machete, and a compass. Fishhooks and a line, a
　rifle and ammunition, matches in a waterproof container,
　and a poncho are necessary too. Such is a mosquito net 4.__________
　to pretect the head.

　In the jungle you can get hopeless lost within 5.__________
　five minutes after leaving a knowing landmark. That is 6.__________
　why you should always carry a compass. In open country,
　during the day, you can tell which way to go by studying
　the sun. At night the stars are sure of guides to direction 7.__________
　But in most places the jungle rooftop is so thick
　that this is impossible to see the sun or the stars. Again 8.__________
　and again you must check the position by the compass.

　Keep alert. Watch the ground in front of you carefully.
　Stop and listen now and again. Avoid haste, and rest
　often. In a place where is hot and humid, the person who 9.__________
　sets a fast pace will soon become tired. A steady, even
　pace is wisest on the long run. 10.__________

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　The first man known to use a signal other than a
　bonfire used a chandelier. He was lord of a castle that
　stood near a rocky seacoast. He hang the chandelier, 1.__________
　containing many large tallow candles, in the highest
　tower of his castle. Thus he warned passing ship from 2.__________
　the danger along the coast.

　Candles soon became the common fuel for signal
　lights. They were later replaced by oil lamps, that 3.__________
　could burn larger and brighter. Kerosene and gas lamps 4.__________
　also tried. These are still in use now in some smaller
　lighthouses. But today most lighthouses sent electric 5.__________
　light blazing out over the sea.

　The ancient fire signals only say "Danger! Keep off!".

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