单项选择题


Questions 23 to 25 are based on the conversation you have just heard.

A．The surface of the ocean is expanding.
B．The surface of earth contains tons of cosmic dust.
C．Volcanic activity is increasing.
D．Thousands of comets are colliding with earth’s atmosphere.
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单项选择题
A．From the western United States.B．From only the east coast of the American Continent.C．From all parts of the country.D．From San Francisco Bay.
A．From the western United States.
B．From only the east coast of the American Continent.
C．From all parts of the country.
D．From San Francisco Bay.
单项选择题
How do people show the right level of energy without seeming over the top
A．By underestimating the energy level.
B．By estimating an energy scale.
C．By undervaluing the energy level.
D．By using a lower level of energy.
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