castrol英语职称考试理工类A级练习题及答案
以下是网的英语职称理工类A级练习题，希望对大家有所帮助。
Only special plants can survive the terrible climate of a dert， for the are regions where the annual range of the soil temperature can be over 75℃. Furthermore， during the summer there are few clouds in the sky to protect plants from the sun's ray. Another problem is the fact that there are frequently strong winds which drive small， sharp particles of sand into the plants， tearing and damaging them. The most difficult problem for all forms of plant life， however， is the fact that the entire annual rainfall ours during a few days or weeks in spring.
Grass and flowers in dert survive from one year to the next by existing through the long， hot， dry ason in the form of eds. The eds remain inactive unless the right amount of rain falls. If no rain falls， or if insufficient rain falls， they wait until the next year， or even still the next. Another factor that helps the plants to survive is the fact that their life cycles are short. By the time that the water from the spring rains disappears —— j
ust a few weeks after it falls —— such plants no longer need any.
The perennials have special features which enable them to survive as plants for veral years. Thus， nearly all dert perennials have extensive root systems below ground and a small shoot system above ground. The large root work enables the plant to absorb as much water as possible in a short time. The small shoot system， on the other hand， considerably limits water loss by evaporation.
Another feature of many dert perennials is that after the rainy ason they lo their leaves in preparation for the long， dry ason， just as trees in wetter climates lo theirs in preparation for the winter. This reduces their water loss by evaporation during the dry ason. Then， in next rainy ason， they e fully alive once more， and grow new branches， leaves and flowers， just as the grass and flowers in dert do.
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16. Ordinary plants are unable to survive in the dert mainly becau of the changeable weather. demand>yellowstar
A. Right B. Wrong C. Not mentioned
17. Grass and flowers in dert are able to survive becau they stay in the form of eds to wait for the right amount of water to e.
毁誉参半
A. Right B. Wrong C. Not mentioned
18. Grass and flowers in the dert who life cycles are short shows their ability to adapt to the quick disappearance of rainwater there after it falls in spring.
A. Right B. Wrong C. Not mentioned
19. Winter is the toughest ason for grass and flowers to survive in dert
A. Right B. Wrong C. Not mentioned
20. The shoot system of perennials can help the plants absorb less of the sun's ray.
A. Right B. Wrong C. Not mentioned
21. The theme of the cond last paragraph is why the perennials can survive as plants for veral years.
A. Right B. Wrong C. Not mentioned
22. Dert perennials lo their leaves after the rainy ason just as trees lo theirs in wetter climates before winter arrives， but the reasons for this feature are
different.
A. Right B. Wrong C. Not mentioned
unconditional
参考答案：16. B17. A18. A19. C20. B 21. A22. B
我爱祖国演讲稿
Living in space looks like lots of fun. You can do certain things in space (like floating around, or pushing huge objects) that you cannot do on earth. But being in space can do things to you, too. If you stay too long in a gravity-free environment, your bones could bee weak, and a small spaceship just might annoy you after a while, becau space travel could make you asick!
您好英文 On July 4, 1982, after ven days orbiting the earth, astronauts Thomas K. Mattingly an
the event
d Henry W. Hartsfield returned home. Although not all of the experiments on board worked properly, the flight basically emed to be a suess except for one "little" thing: early in the flight, astronaut Hartsfield became "asick".
Thomas Mattingly, who is also a jet pilot and is highly resistant to motion sickness on earth, did much better. Mattingly sailed through space with a steady stomach. But no one knows why Hartsfield felt uneasy and Mattingly did not.
retail So far it ems there is no reliable way to predict who will bee motion sick in outer space and who will not. in all, at least four astronauts have suffered from space motion sickness. Russian and American scientists are working together to try to understand and solve the motion sickness. Space program officials worry that if so many highly-trained pilots get sick in space, what will happen when civilians start flying in the shuttle?
Motion sickness is a disagreeable feeling that es from the pitching, rolling, swaying, or just the moving of the object you are riding in or on. Symptoms of motion sickness include: dizziness, headache, a sinking feeling in the stomach, and vomiting.
