When the roads became too slippery, we decided______to the cabin and wait for the storm to
A.to return
B.to return back
C.returning
D.to returning
A.to return
B.to return back
C.returning
D.to returning
Which of the following can be inferred from Paragraph 1 about human ancestors?
A.They became predominantly right-handed when they began to use tools.
B.It is difficult to know with which hand they normally used tools.
C.They had been predominantly right-handed for over a million years.
D.They were more skilled at using both hands than modern humans.
A.domestication
B.foreignization
C.transliteration
D.paraphrasing
A common example of bad manners on the roads is
A.not signaling when overtaking.
B.following no traffic lights.
C.preventing other vehicles from overtaking.
D.making holes in the roads on purpose.
Dogs who accompany blind people must learn______.
A.to obey all orders
B.to obey only safe orders
C.never to cross busy roads
D.to cross roads when commanded
A.was raining
B.would be raining
C.had been raining
D.have rained
—Was the driving pleasant when you vacationed in Mexico (墨西哥) last summer? —No, it______ for four days when we arrived so that the roads were very muddy.
A.was raining
B.had been raining
C.would be raining
D.have rained
A.was raining
B.would be raining
C.had been raining
D.have rained
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