单项选择题

Questions 29 to 31 are based on the passage you have just heard.

A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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单项选择题
A．Only one out of four girls cries less often than boys.B．Of four boys, only one cries very often.C．Girls cry four times as often as boys.D．Only one out of four babies doesn’t cry often.
A．Only one out of four girls cries less often than boys.
B．Of four boys, only one cries very often.
C．Girls cry four times as often as boys.
D．Only one out of four babies doesn’t cry often.
单项选择题
A．Late in the morning.B．Early in the afternoon.C．Sometime before dawn.D．Shortly after sunrise.
A．Late in the morning.
B．Early in the afternoon.
C．Sometime before dawn.
D．Shortly after sunrise.
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