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【单选题】
设全集U=R，集合A={x|x 2 -x-30＜0}，B={x| cos πx 3 = 1 2 }，则A∩B等于（ ）A.
{-1，1，5}
B.
{-1，1，5，7}
C.
{-5，-1，1，5，7}
D.
{-5，-1，1，5，}
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【单选题】已知反应A(g)+2B(l)=4C(g)的平衡常数为K=0.123，则反应2C(g)=1/2A(g)+B(l)的平衡常数为( )。
A.
8.13
B.
0.35
C.
6.62
D.
2.85
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Mother and son.
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Teacher and student.
D.
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A.
a few functions, but it will perform. all in the future
B.
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C.
taken place of other means of communication system
D.
developed fast
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A.
Leave the theatre at the end of the performance.
B.
Take pictures of actors during the interview.
C.
Speak clearly into the microphone.
D.
Allow others to ask questions.
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A.
Creates
B.
Created
C.
The creating of
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To create
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