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【单选题】
下列关于集合的表示中正确的为( )A.
{a} Î {a,b,c}
B.
{a} Í {a,b,c}
C.
ÆÎ {a,b,c}
D.
{a,b} Î {a,b,c}
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【单选题】听力原文：When does the new brand launch? (A) It's a new type of toothpaste. (B) The last week of August, (C) At a ceremony at corporate headquarters. (6)
A.
B.
C.
【单选题】The purpose of the writer is______.
A.
to suggest how new type of harbor could be built at sea
B.
to give a description of a new-type city
C.
to draw people's attention to the problem of air pollution
D.
to introduce a mew way of building harbor-cities
【单选题】The new type of cellphone better if it is advertised on TV.
A.
． will sell
B.
． sells
C.
． would sell
D.
． sold
【单选题】2 -Let's listen to my new type, shall we?-___.
A.
Any time will do
B.
It's right
C.
That sounds like a good idea
D.
That's all right
【简答题】何谓肺换气?影响肺换气的主要因素有哪些?
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