短文填空。Do you know Sweden?It l (1)in the north of Europe. It is the fourth largest country in Europe with an area of 450,000 square kilometers and a p (2) of about 8.5 million. Over one thir
吸毒严重危害人体健康与社会安宁,是世界的一大公害。摇头丸是国家严禁的一种毒品,化学式为C9H13N,它由_________种元素组成,每个分子有_____个原子
We’ll go for a walk if it _________ tomorrow. A. will not rain B. isn’t raining C. doesn’t rain D. rains
I came in tired and happy and badly in need_____ a bath. However, my elder brother insisted there wasn’t much need______ one A. of; for B. for; of C. for; for D. of; of
选出对下面一段话分析正确的一项 ( ) 她需要做手术,可手术费需要七万元啊!这对一个农村家庭来说,是多么沉
在一恒温体积可变的密闭容器中发生如下反应:A(g)+B(g)2C(g) △H<0。t1时刻达到平衡后,在t2时刻改变某一条件,其反应过程如图。下列说法正确的是
已知在⊿ABC中,∠A=48°,∠C=84°且AB=3cm AC=4cm,则三角形的周长是( )A.7cmB.10cmC.11cmD.10cm或11cm
图为生态系统各成分之间的相互关系,据图分析回答下列问题: (1)图中植物的是 。 (2)图中细菌和真菌是 。 (3