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【判断题】
山东蓝宝石具有明显的三色性A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Which of the following statements about the Alzheimer's disease is NOT true?
A.
It was so named because Alois Alzheimer first described it.
B.
It is the greatest cause of mental deterioration in older people.
C.
It can gradually destroy memory and eventually cause death.
D.
There are many ways to deal with and cure the disease now.
【简答题】本公文发文字号正确的一项是（ ）。
【单选题】______some ads can be very useful. [ ]
A.
Its true
B.
That's true
C.
It's true that
D.
This is true
【单选题】Which of the following Statements is NOT true?
A.
The U.S.1ife expectancy is at a，n all-time high.
B.
The U.S.death rate was at an all：time low in 2005
C.
The annual death rate in the U.S.is over 800 deaths per 100,000
D.
Chronic disease appears to be at an all—time high in the U.S.
【单选题】It’s true that whoever ____positive for H7N9 will receive free medical treatment from our government without delay.
A.
is tested
B.
is being tested
C.
has tested
D.
tests
【单选题】Which of the following is true as to the essential functions of the U.N. ?
A.
It's only concerned with human rights.
B.
It only solves economic and cultural problems.
C.
It co-ordinates actions of' nations where necessary.
D.
It only aims to develop friendly relations.
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