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【单选题】
Tom cannot tell the difference between Coke and Pepsi. For Tom, these goods are ______.A.
perfect substitutes.
B.
perfect complements.
C.
necessities.
D.
None of the above.
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举一反三
【单选题】The question_______ you should take this medicine should be decided by your family doctor.
A.
why
B.
whether
C.
if
D.
that
【单选题】A doctor should be _____ for the lives of the patients.
A.
suitable
B.
famous
C.
responsible
D.
competent
【单选题】在电极式锅炉水位控制系统中,若给水泵马达启动频繁,则可能原因是__________。
A.
高、低水位电极高度差太小
B.
低水位与危险水位电极的高度差太大
C.
高、低水位电极高度差太大
D.
低水位与危险水位电极的高度差太小
【简答题】What did the doctor suggest the woman should do? [A] She should take some medicine and have a good rest at home. [B] She should stay in hospital for a few days. [C] She should come again in a day or t...
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