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【单选题】
对于一个密码体制，( )是公开的，对于某次具体加密过程，（ ）是保密的A.
明文空间 密文空间
B.
明文空间 算法
C.
算法 密钥
D.
密文空间 密钥
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【单选题】Because of the severe snow storm and the road blocks, the air force dropped food and medical supplies close the city.
A.
Because of
B.
the
C.
dropped food
D.
close the city
【单选题】—I’m sorry I stepped on your foot; it was an accident. —It wasn’t! You did it ______________ .
A.
as usual
B.
on purpose
C.
at an end
D.
right away
【单选题】— I'm sorry !I broke the window of your car while I was playing football. — What? _____I really wanted to hit you. [ ]
A.
That couldn't be better.
B.
It does you good.
C.
I'm with you on that.
D.
You little rascal!
【单选题】要配制pH=5的缓冲溶液,选用下列哪组缓冲对
A.
HAc－NaAc(pKa＝4.75)
B.
H 2 CO 3 －NaHCO 3 (pKa＝6.37)
C.
HCOOH－HCOONa(pKa＝3.76)
D.
H 3 PO 4 －NaH 2 PO 4 (pKa＝2.13)
【单选题】. . Shanghai is trying to control ________ number of cars on the road to ensure clean air for ________ 2010 World Expo.
A.
a ; /
B.
a ; the
C.
the ; /
D.
the ; the
【简答题】A．air transport B．road transport C．rail transport D．multimodal transport
【简答题】Read and choose. (读一读，选一选) I'm Tom. I'm from Canada. I'm tall. 1 like playing the piano. I like playing basketball. I like collecting stamps. I live next to my school. I'm going to be a teacher in the...
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