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【简答题】
Which years were the 'lost years' mentioned by the author in para. 3? What caused those years to be 'lost'?
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反馈参考答案：
举一反三
【单选题】假设你想证明:每一个可以写成k(k+1)(k+2)的整数乘积都能被6整除。如果你想用分情形证明法来证明它,那么你应该用下面哪一个集合?
A.
乘积以3结尾;乘积以6结尾;乘积以9结尾。
B.
当k被3除,余数为0;当k被3除,余数为1;当k被3除,余数为2;
C.
k=3^n,k≠3^n
D.
k是质数,k不是质数。
【简答题】Turn-taking is a characteristicof ____________.
【单选题】— How is your sister? — She _______ quite good after the operation, but she is taking a turn for the worse today.
A.
felt
B.
feels
C.
had felt
D.
has been feeling
【单选题】The central government is taking measures to the prices of daily necessities.
A.
put down
B.
turn down
C.
bring down
D.
take down
【简答题】Be ______(prepare) for financial loss and get advice on how to alleviate that burden in the future.
【单选题】--- Do you know the reason _________ pilots turn off the plane’s lights before taking off? ---The practice is for the passengers to adjust to the dark _________ an emergency.
A.
why; for fear that
B.
for which; in case of
C.
how; for fear of
D.
that; in case
【单选题】[Based on Figure 6-17] How is the burden of the tax shared between buyers and sellers? Buyers bear
A.
three-fourths of the burden, and sellers bear one-fourth of the burden.
B.
two-thirds of the burden, and sellers bear one-third of the burden.
C.
one-half of the burden, and sellers bear one-half of the burden.
D.
one-fourth of the burden, and sellers bear three-fourths of the burden.
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