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【单选题】
维生素D的活化形式是A.
1,17-(OH) 2 D 3
B.
1,19-(OH) 2 D 3
C.
1,25-(OH) 2 D 3
D.
1,22-(OH) 2 D 3
E.
1,20-(OH) 2 D 3
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举一反三
【单选题】According to this article, we
A.
often think seriously when we are dreaming.
B.
hardly ever hear music when we are dreaming.
C.
very often feel something tastes good when we are dreaming.
D.
almost always see different 'pictures' when we are dreaming.
【单选题】According to news report, personal ______ of guns in the USA causes a lot of trouble.
A.
wealth
B.
possession
C.
need
D.
matter
【单选题】According to the passage, which of the following was the earliest kind of 'exchange of wealth?
A.
Bartered goods.
B.
Fiat money.
C.
Coin currency.
D.
Intangible forms.
【单选题】According to the text, which of the following people riding in the front do nothave to wear a seat belt ? ( )
A.
Someone who is backing into a parking space.
B.
Someone who is picking up the children from the local school.
C.
Someone who is delivering invitation letters.
D.
Someone who is under 14.
【单选题】Which of the following statements is NOT true according to the author?
A.
The person who wears a uniform. has no self-worth.
B.
Wearing a uniform. gives a person a sense of identification with a larger concept.
C.
Uniforms will hurt one entire information and entertainment industry.
D.
Envy and competition are incentive to improve one's life.
【单选题】According to the author, gambling may lose its fascination if we
A.
create more chances.
B.
do not take it so seriously.
C.
organize more other activities.
D.
help develop an interest in other activities.
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