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【简答题】
已知圆C：x 2 +y 2 -x+2y=0，直线l：x-y+2=0 （I）判断直线l与圆C的位置关系； （Ⅱ）由点P（ 1 2 ，l）C引切线，求其切线长．
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举一反三
【单选题】his surprise, the woman a baby is his mother.
A.
To, and
B.
With, to
C.
To, with
D.
With, has
【单选题】To his surprise, his speech at the meeting ________ the students silent.
A.
caught
B.
took
C.
held
D.
Keep
【简答题】To his surprise, his new play well ____ by the public in China, met a cold welcome abroad. A．received B．accepted C．accepting D．receiving
【单选题】As soon as Charles had _____ a little from his surprise, his one thought was to get away.
A.
returned
B.
absorbed
C.
dissolved
D.
recovered
【简答题】工程测量成果主要包括( )
【单选题】To his surprise, Jack found his son ______ as Santa Claus on Christmas Eve.
A.
dressed
B.
dressing
C.
to dress
D.
being dressed
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