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【单选题】
如果定时/计数器2的输入时钟CLK2为1KHz，采用1方式，且要求输出的低脉冲的宽度为4秒，则定时/计数器0的计数初值应该是（ ）。A.
5000D
B.
4000D
C.
500D
D.
400D
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【单选题】Zhai Zhigang, LiuBoming and Jing Haipeng went into space on . Their flight around the earth lasted about _____ hours. [ ]
A.
September 24, 2008, 67
B.
September 25, 2008, 68
C.
Semtember 26, 2008, 69
D.
September 27, 2008, 70
【简答题】Thank you for(call)_________.
【简答题】What is the life expectancy of Earth?
【单选题】A solar day is the length of time _______ the Earth to revolve once around the sun.
A.
takes
B.
takes it
C.
it takes
D.
he takes
【多选题】A:Thank you for the morning call.B:( )
A.
That's all right.
B.
You are welcome.
C.
My pleasure.
D.
Not at all.
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