Why do you think the author talks about slaves before the Civil War and not after？
A. Because slaves are more interesting to talk about before the Civil War.
Because there were more slaves than ever after the Civil War.
C. Because there were no more slaves after the Civil War.
D. Because there was no difference.
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"The long summers of forgetting take a toll" in the last paragraph but one means that ______.
A. long summer vacation slows down the progress of learning
B. long summer vacation has been abandoned in Europe
C. long summers result in less learning time
D. long summers are a result of tradition
Which of the following statements is NOT true？
A. Continuous computer calculations are required for the automatic blind landing of an aircraft.
B. Military applications of computers require their very fast response ability.
C. Scaling down of all dimensions of a computer may result in faults developing.
D. The development to integrated circuits contributes a lot to the miniaturization of computers.
Since the author tells you that there were hundreds of slave-owning cattle ranchers in Texas, it is possible to say that ______.
A. Blacks didn't help to settle Texas
Blacks helped to settle Texas
C. Blacks helped only sometimes to settle the new territory
D. Blacks only helped to tame cattle
Why did the writer finally decide to buy three skirts？
A. The skirts were cheap and pretty.
B. She liked the patterns on the skirts.
C. She wanted to do something as compensation.
D. She was fed up with further bargaining with the woman.
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