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Passage Three
Questions 17 to 20 are based on the
following passage:
17.A) Call on people to protect sharks.
B) Point out the living environment of
sharks.
C) Explain why the sharks are dangerous.
D) An introduction to sharks.
18.A)By good sense of water waves made by
quarries.
B)By good sense of smell and electrical
magnetic power.
C)By good sense of light.
D)By good sense of blood.
19.A) Bone structure.
B) Smell ability.
C) Birth mode.
D) Recover ability against disease.
20.A) Their tasty meat.
B) The principle of their defense system
against disease.
C) Their solid skin.
D) The principle of their birth modes.
Part Ⅱ
Reading Comprehension(35 minutes)
Passage One
Questions 21 to 25 are based on the
following passage:
Scientists say there has been a severe
decrease in the amount of water in Lake Chad in northern Africa in the last
thirty years. They report that nature and humans share equal blame for this
loss.
In 1963 the fresh water lake covered
twenty-five-thousand-square kilometers.Now the lake is only about five percent
of that size.It measures only about one-thousand-three-hundred square
kilometers in the dry season.
Four nations surround Lake Chad. People in
Niger, Nigeria, Chad, and Cameroon use it for water, fish and plant life.
Michael Coe and Jonathan Foley are water
experts at the University of Wisconsin in Madison.They reported about Lake Chad
in the Journal of Geophysical Research.They say the area has suffered from a
lack of heavy rain for more than thirty years.This has forced people to build
systems to carry water to dry land.These irrigation systems further decrease
the lake.
Mister Coe says Lake Chad will be only a
small body of water in the future. He says people still can get water from the
lake to drink and for crops. But he says the lake will no longer provide a
healthy environment for fish and plant life.
The researchers used a computer to study
what caused the water loss. Their computer study estimated the climate and
amount of water in the area. The estimate started with the early 1960s. Then
the researchers compared the estimates with the area's recorded climate and
water supply for the same period.
The computer study showed results similar
to the recorded ones for the first twenty years. But there was a big change in
the 1980s. At that time, the lake got smaller much faster than the computer
research had estimated.
The researchers say major irrigation
systems were built in the 1980s. The systems took water from two rivers that
flow into Lake Chad. The Chari and Logone rivers carry most of the water that
enters the lake. The study showed the increased irrigation reduced the flow in
the two rivers. Climate changes also were responsible for the reduction. Today
the flow of the two rivers has been reduced by almost seventy-five percent.
Scientists say the problem is expected to
worsen in the coming years as the population and demand for water continue to
increase.
21.What is this passage mainly about?
A) Demonstrating the serious weather
condition around Lake Chad.
B) Introducing people's activity around
Lake Chad.
C) Analyzing of the factors that cause
water decreases in Lake Chad.
D) Introducing scientists' work about water
condition in Lake Chad.
22.What did people do to solve the problem
of rain lack around Chad Lake?
A) They moved out of this area.
B) They drew water from Lake Chad.
C) They carried water from other areas.
D) They utilize seawater near this area.
23.Which of the following is true according
to this passage?
A) Chad Lake located in the middle of Chad
in northern Africa.
B) The water from Chad water can now only
be used for irrigation.
C) The area around Chad Lake has suffered
from heavy rain lack many decades.
D) Population around the Chad Lake now
begins to decrease due to water lack.
24.Why computer data become imprecise in
1980s?
A) The related programs on the computer
were out of date.
B) More and more people drew water directly
from the lake for drink.
C) A heavy rain happened around 1980.
D) The irrigation from the source water
increases.
25. What is scientists' attitude towards
the future of Chad Lake?
A) Pessimism. B) Hopeful.
C) Indifferent. D) Doubtful.
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