单项选择题

Questions 18-21 are based on the passage you are going to hear. According to the passage what causes tidal waves

A．Earthquake
B．Storms.
C．Seaquake.
D．Tides.
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单项选择题
How much time did she have before her meeting
A．6 hours.
B．5 hours.
C．4 hours.
D．1 hour.
单项选择题
Which of the following assumptions about early humans is expressed in the passage
A．They probably had extensive knowledge of plants.
B．They thought there was no need to cultivate crops.
C．They did not enjoy the study of botany.
D．They placed great importance on the ownership of property.
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