单项选择题

We can infer from the passage that scientists are ______.

A．writing reports
B．observing what happened to San Francisco
C．providing more information about the California Earthquake
D．learning more about earthquakes

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单项选择题

One of the reasons why the California Earthquake is very impressive is that ______.

A．it was the first time that so many people were killed
B．it was over suddenly
C．the damage and destruction of the city could be easily seen
D．the damage and destruction of the city were nothing unusual

单项选择题

It is usually argued that the earliest influences______ up-children will most likely have the strongest effect on their personalities.

A．exerted
B．exerting
C．exercised
D．exercising