Tsunami，a Japanese word, translated as “harbor wave”， is caused by ________sudden rise or fall of part of the earth's surface under or near ________ocean. A．a；a
It was Mr. Green for ________ life had been very hard ________ donated his possessions to earthquake-hit families in Sichuan. A. whose; that B. whom; that C. which; who
,则
的解集为 .
是奇函数，所以原不等式转化为
，结合图象可得不等式的解集.