题目内容
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According to the author, manufacturers______.
A．should add more useful features to their machines
B．often fail to make their products easy to use
C．should make their appliances as attractive as possible
D．often fail provide proper training in the use of their products
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A、Subsistence economies
B、Raw material exporting economies
C、Industrializing economies
D、Industrial economies
A．they can do so at a very Iow cost
B．they find their machines hard to operate
C．they have difficulty selling their products
D．they receive a lot of complaints about their machines
A．the desirers are often insensitive to the operational complexities of their machines
B．the range of features provided is unlimited
C．there is no ideal way of controlling quality
D．their designers often ignore the complaints of their uses
Climate, more than any other single factor, determines the distribution of life on Earth. Climatic boundaries establish the limits within which organisms can survive. Plants, even more than animals, must be well adapted to climate in order to survive. They cannot move about or take shelter but must be equipped to endure whatever weather conditions are likely to occur. In the harsh conditions of the tundra (苔原), for example, low growing mosses, lichens, and a few flowering plants all hug the ground for shelter from icy winds.
Animals, despite their ability to move about and find shelter, are just as much influenced by climate as plants are. Creatures such as the camel and the penguin are so highly specialized that they have an extremely limited distribution. Others, such as bears, are flexible enough to adapt to a broad range of climates. Ocean-dwelling organisms are just as sensitive to climatic changes-- in this case temperature and salinity—as land animals. Reef corals (珊瑚) can survive only in clear warm seawater. Certain foraminifers are so sensitive to changes in their environment that their presence can be taken as an index of sea temperature. Human beings are among the least specialized of all animals and can bye almost anywhere. Their clothes and their homes act as a sort of "miniature climate" that can be taken with them everywhere.
According to the passage, plants on the tundra grow in the ground______.
A．to avoid being eaten by arctic animals
B．because fertilizer is not readily available
C．to minimize exposure to the cold
D．because unfrozen water supplies are very scarce
A．kind of weather pattern
B．form. of sea life
C．species of tundra plant
D．type of miniature penguin
A．Reef corals.
B．Bears.
C．Penguins.
D．Camels.
A．they have developed advanced forms of transportation
B．they have learned how to process seawater for drinking
C．their body temperature can vary considerably
D．their shelters and clothes help them to adapt themselves to the environment
A．keep silent
B．surrender
C．to be defeated
D．suffer
A．Practical at an appropriate cost.
B．Impossible due to the high price.
C．Necessary at all cost.
D．Unwise regardless of the cost.
A．Most people develop relationships simply to enjoy a long life.
B．Rewarding human relationships are essential to life.
C．New relationships can be established on mutual interests.
D．Telling friends about their strengths will make them feel better about them- selves.
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