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单元综合测评(五)
Ⅰ.阅读理解(共 15 小题;每小题 2 分,满分 30 分)
A
The year is 2094.It has been announced that a comet (彗星) is heading towards the
Earth.Most of it will miss our planet ,but two pieces will probably hit the southern half
of the Earth.
On 17 July ,a piece four kilometers wide enters the Earths atmosphere with a
massive explosion.About half of the piece is destroyed ,but the remaining part hits the
South Atlantic at 200 times the speed of sound.The sea boils and a huge hole is made in
the sea bed.Huge waves are created and spread outwards from the hole.The wall of
water ,a kilometer high ,rushes towards southern Africa at 800 kilometers an hour.Cities
on the African coast are totally destroyed and millions of people are drowned.
Before the waves reach South America ,the second piece of the comet lands in
Argentina.Earthquakes and volcanoes are set off in the Andes Mountains.The shock
waves move north into California and all around the Pacific Ocean.The cities of Los
Angeles ,San Francisco and Tokyo are completely destroyed by earthquakes.Millions
of people in the southern half of the earth are already dead ,but the north wont escape
for long.Because of the explosions ,the sun is hidden by clouds of dust ,temperatures
around the world fall to almost zero.Crops are ruined.The sun wont be seen again for
many years.Wars break out as countries fight for food.A year later ,no more than 10
million people remain alive.
Could it really happen ?In fact ,it has already happened more than once in the
- 1 -
history of the Earth.The dinosaurs were on the Earth for over 160 million years.Then 65
million years ago they suddenly disappeared.Many scientists believe that the Earth was
hit by
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