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【单选题】
肺换气的过程是指A.
外界环境中的O2进入肺泡
B.
肺泡与外界环境进行气体交换
C.
肺泡与血液进行气体交换
D.
肺泡内气体不断更新的过程
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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.
【单选题】Which of the following is true about the U.S. Navy underwater listening network?.
A.
It is now partly accessible to civilian scientists.
B.
It has been replaced by a more advanced system.
C.
It became useless to the military after the cold war.
D.
It is indispensable in protecting endangered species.
【简答题】本公文发文字号正确的一项是（ ）。
【单选题】— Is _____ true that Americans eat hamburgers and hot dogs every day? — No, that's not true, but they are both very popular foods in America. [ ]
A.
this
B.
anything
C.
it
D.
something
【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】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
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