——Where is your school bag?——I think I ______ it during the concert so it might still be in the symphony hall.A. dropped B. threw C. fell
下列不属于生物多样性的是A.物种多样性B.数量多样性C.基因多样性D.生态系统多样性
阅读下面一段文言文,完成11—15题。 庾冰字季坚。兄庾亮以名德流训,冰以雅素垂风,诸弟相率莫不好礼,为世论所重,亮常以为庚氏之宝。司徒辟,
下面两图都是时钟在平面镜中成的像,它们的实际时间是甲: ;乙: 。
下图甲表示将A植物放在不同浓度的C02酵母菌环境条件下,A植物光合效率受光照强度影响的变化曲线;图乙表示胡萝卜在不同的含氧情况下从硝酸钾溶液
完形填空。We've always been making dreams.Dreams are different from person to person,and also from time to time.But at a certain time,people share the _1__ dreams.In the 1970s,the secondh
填入下面一段文字中横线处的语句,与上下文衔接最恰当的一项是 ( ) 我们的时代,是百花齐放的时代,我们不但要盈亩满畦的牡丹和菊花,我们也要树