单项选择题

According to the passage, the Anasazi buildings were made primarily of______.

A．dried mud
B．blocks of wood
C．sandstone
D．the skins of animals
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单项选择题
According to the entry, the sentence My mother preferred rather to live in the country than to live in the city is______.
A．very common in both written mid spoken English
B．very rare in both written and spoken English
C．more common in spoken than in written English
D．more common in written than in spoken English
单项选择题
It can be inferred from the passage that a soil sample with little or no clay in it ______.
A．will feel smooth when wet
B．may not keep its shape when molded
C．will be difficult to classify
D．may be sticky if too wet
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