单项选择题

Carl came back to our city to （）

A．take his summer vacation
B．look after his grandpa
C．swim in the river
D．know what happens

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单项选择题

The author states that all glaciers （）

A．are two miles thick
B．form frozen lakes
C．are a million years old
D．move and slide

单项选择题

Which of the following can take the place of the sentence when people live in plenty ... （）

A．When people have more money than is needed...
B．When people have quite a large amount of wealth...
C．When people no longer worry about not having enough for their daily needs of food or clothing ...
D．When people need a large number of daily needs...