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【单选题】
已知直线L：3x+4y-1＝0，则点A(x0，y0)关于L的对称点坐标为 (1)x0＝2，y0＝0 (2)x0＝0，y0＝2A.
条件(1)充分，但条件(2)不充分。
B.
条件(2)充分，但条件(1)不充分。
C.
条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分。
D.
条件(1)充分，条件(2)也充分。
E.
条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分。
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举一反三
【单选题】I think the book is ____ and it is ____. What's your opinion? [ ]
A.
useful; a help
B.
of useful; helpful
C.
of interest: interested
D.
of use; of very help
【单选题】若每一条指令都可以分解为取指，分析和执行三步。已知取指时间t取指=8△t，分析时间t分析＝3△t，执行时间t执行＝12△t。如果按照流水线方式执行指令，从头到尾执行完 100条指令至少需(41) △t。如果取指时间t取指=8△t，分析时间t分析＝12△t，执行时间 t执行＝3△t，则从头到尾执行完100条指令至少需(42)△t。
A.
1200
B.
1223
C.
1224
D.
1211
【单选题】I felt it is my responsibility _____you of our decision.
A.
inform
B.
to inform
C.
informing
D.
informed
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