Tuyển tập 353 đề thi học sinh giỏi môn Tiếng Anh lớp 6,7,8,9,10,11,12 (có đáp án)

much that they are in _________(4) of becoming extinct. These concerned people are working to save
the whales.
Why do people want to save the whales? There are two important reasons. One reason is that whales
help to keep a balance between plants and animals. People have __________(5) this balance. People get
rid of their wastes by throwing them into the oceans and seas. People’s sewage and garbage increase the
_________(6) of salt in ocean and sea water. The increased salt helps some plants and some very small
animals _________(7). These plants and animals can be _________(8) to fish. Whales eat enormous
amounts of plankton, the plants and animals that thrive in very salty water. __________(9), whales are
very important because they keep the ocean environment clean enough for fish. In addition, because fish
__________(10) necessary food for many people, people need whales, and many people want to save
them.
1.A. of B. about C. to D. with
2. A. little B. great C. large D. small
3. A. in B. since C. at D. of
4. A. dangerous B. endangered C. danger D. dangered
5. A. distributed B. destroyed C. disturbed D. followed
6. A. number B. amount C. variety D. much
7. A. grow B. develop C. appear D. increase
8. A. good B. useful C. harmful D. bad
9. A. Therefore B. However C. But D. Moreover
10. A. bring B. provide C. give D. take
II. Read the following passage and then choose the best answer by writing the letter A, B, C or D on
the answer sheet.
Line
(5)
(10)
(15)
Just two months after the flight of Apollo 10, the Apollo 11 astronauts made their historic
landing on the surface of the Moon. This momentous trip for humanity also provided
scientists with an abundance of material for study; from rock and soil samples brought back
from the Moon, scientists have been able to determine much about the composition of the
Moon as well as to draw interferences about the development of the Moon from its
composition.
The Moon soil that came back on Apollo 11 contains small bits of rock and glass which were
probably ground from the large rocks when meteors impacted with the surface of the Moon.
The bits of glass are spherical in shape and constitute approximately half of the Moon soil.
Scientists found no trace of animal or plant life in this soil.
In addition to the Moon soil, astronauts gathered two basic types of rocks from the surface of
the Moon: basalt and breccia. Basalt is cooled and hardened volcanic lava common to the
Earth. Since basalt is formed under extremely high temperatures, the presence of this type of
rock is an indication that the temperature of the Moon was once extremely hot. Breccia, the
other kind of rock brought back by the astronauts, was formed during the impact of falling
objects on the surface of the Moon. This second type of rock consists of small pieces of rock
compressed together by the force of impact. Gases such as hydrogen and helium were found
in some of the rocks, and scientists believe that these gases were carried to the Moon by solar
wind, the streams of gases that are constantly emitted by the Sun.
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