专四
A．snakes do not begin the aggressive act if it is not disturbed.
B．some snakes are more aggressive and more ready to attack.
C．it is hard to forecast whether and how snakes would attack.
D．snakes often conceal themselves as their principal defense.
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According to the author, when should be regarded as the beginning of human history?
A．The appearance of vertebrates.
B．The point when human beings consciously chose to do something.
C．The coming into being of the photosynthetic cells.
D．The origins of the universe,
A．it is one part of human history:
B．it should be included in the history of the universe.
C．it can partly explain the way of life of the people in the past.
D．it decided the human history,
A．language is unique to man.
B．man is a tool-maker.
C．man is characteristic of the possession of vocal equipment.
D．man has remarkable level of activity and creativity.
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Write on ANSWER SHEET THREE a note of about 50-60 words base
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The author would read the words aloud _________．
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根据以下资料，回答题：
Dried foods
Nowadays vegetables are most commonly dried
Alkaline solutions are used to