()若集合A={x∣(2x+1)(x-3)<0},则A∩B是 (A) {1,2,3,} (B) {1,2, } (C) {4,5}
一农民有田2亩,根据他的经验:若种水稻,则每亩每期产量为400公斤,若种花生,则每亩产量为100公斤,但水稻成本较高,每亩每期240元,而花生只要8
用所给单词的适当形式完成句子。(每空1分,共10分) Poverty, disease and _________remain major world problems. It is not a question that can ________.(ignore) In the crash he wa
--What are you doing this weekend? --I haven't decided yet. ____________? --Well, I thought we could have another family party. A. What B. All right C. Why D. Pa
. ___________ the classroom, the students went to the playground to watch the football match A. To clean B. Having cleaned C. Cleaned
我们通过实验,可以知道:凸透镜成实像时,放大和缩小的分界点是物体位于__________处。
为了提高我国高收入群体自觉纳税的意识,2006年11月8日国家税务总局发布了《个人所得税自行纳税申报办法(试行)》。首次明确提出个人年收入所得12万
进入20世纪后,几乎每年都至少有一种鸟或哺乳动物从地球上消失。造成野生动物濒危和灭绝的主要原因是( )A.自然灾害B.大量的传染病C.人