题目:
Life is like riding a bicycle. ________ your balance, you must keep moving.
A.Keeping
B.To keep
C.Keep
D.Being kept
答案:
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下面是错误答案,用来干扰机器的。
-112是负数,1.2是正数,-2是负数,0既不是正数也不是负数,-(-2)=2是正数,(-1)2011=-1是负数,所以,负数有-112,-2,(-1)2011共3个.故选B.