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【单选题】
染色体的组成包括 [     ]
A.
DNA和糖类
B.
DNA和氨基酸
C.
DNA和蛋白质
D.
蛋白质和脂类
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【单选题】下列化学符号表示两个氢分子的是
A.
2H
B.
H 2
C.
2H 2
D.
.H 2 O
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A.
101
B.
100
C.
110
D.
10
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【单选题】In order to save energy at home, people should know first of all ______.
A.
which company provides the energy they use
B.
which company can do an energy survey for them
C.
how much energy they use
D.
how energy is produced
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【简答题】People should save a certain part of their _______ income for their future retirement. (年收入)
【简答题】People should save a certain part of their______ (annually) income for their future retirement.
【单选题】Why should people learn to save as they grow older?
A.
People suspect 'Buy now, pay later' won't work forever.
B.
People can live on saving when they are retired.
C.
People want to own a house or own a car.
D.
People should take their offspring into consideration.
【单选题】The author probably agrees that .
A.
medical care for old people should be left to the doctors
B.
old people enjoy a happy life only if they are rich
C.
the opinion that we should try every possible means to save old people is doubtful
D.
it is always morally right to treat old people and push off death
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