单项选择题


Questions 33 to 35 are based on the passage you have just heard.

A．They can prevent soil from being blown away.
B．They can improve the yield of crops.
C．They can provide wood when cut down.
D．They can protect crops from the strong sunshine.
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单项选择题
Scholar thinks it will be difficult for workers in the U. S. to reduce their working hours because______.
A．they would not be able to afford cars or home
B．employers are offering high incomes for long hours
C．the future is dependent on technological advances
D．they do not wish to return to the humble post-war era
单项选择题
A．How much its accuracy has improved recently.B．How reliable long-range forecasts are.C．How difficult it takes to make a good forecast.D．How the current forecast causes troubles.
A．How much its accuracy has improved recently.
B．How reliable long-range forecasts are.
C．How difficult it takes to make a good forecast.
D．How the current forecast causes troubles.
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