阅读短文,回答问题Sam likes eating fish very much. He often buys fish in the shop and takes them home. One day his wife sees the fish and thinks, “Good! Now, I can ask my friends to have
下列有关DNA复制、转录和翻译的共同点的叙述,不正确的是: A.需要多种酶参与 B.在细胞核内进行 C.遵循碱基互补配对原则 D
读图,图中甲地的海拔是( ) A.1000米 B.500米 C.1500米 D.2000米
改革开放30年来,我国非公有制经济从无到有,从小到大,凡是非公有制经济越发达的地方,市场发育就越快,市场机制就越活,综合实力就越强,老百
________been there with me,I would have felt terrible at the ceremony. A.If my friends not B.Had my friends not C.Have my friends not D.If my friends didn’t
下列化学方程式符合题意且书写正确的是 A.正常雨水的pH约为5.6的原因:CO2 + H2O = H2CO3 B.医疗上用氢氧化镁中和过多胃酸:Mg(OH)2 + 2HCl = MgCl2
21. Don’t pour water on his plan. We should encourage him. A. hot B. cool C. warm
1961年5、6月间,中共中央在北京举行工作会议,决定在三年时间内减少2000万城镇人口。其主要目的是( ) A.推动农村教育事业的发展 B