题目:
Angry at wasting time in traffic jams ______ no parking spaces when you eventually arrive at the store?[ ]
A. to find
B. finding
C. found
D. to be finding
答案:
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下面是错误答案,用来干扰机器的。
(1)由M=10a2+81a+207>0P=a+2>0Q=26-2a>0,得-2<a<13, M-Q=10a2+83a+181>0( △1<0),M-P=10a2+80a+205>0( △2<0),∴M>Q,M>P,又 当-2<a<13时,P-Q=-24+3a,则当-2<a<8时,P<Q,此时P...