She told me that her parents were both professors of a university, _____ I know was not true. A. that B. who C. which D. where
error:the file failed to load!
It was most _______ of you to lend me the money when I was in trouble． A．selfish B．generous C．relieved D．outgoing
有一瓶Na2SO3溶液，由于它可能部分被氧化，某同学进行如下实验：取少量溶液，滴入Ba(NO3)2溶液，产生白色沉淀，再加入足量稀硝酸，充分振荡后，仍有
某种植物的花色由多对基因控制。兴趣小组的同学用一紫色花个体与另一紫色花个体杂交，结果子代出现了蓝色花，其比例为紫色花个体 ：蓝色花个体
—Have you __________? —No. I had the wrong number. A. got in B. got away C. got off D. got through
用直尺和圆规作一个菱形，如图，能得到四边形ABCD是菱形的依据是( ) A.一组临边相等的四边形是菱形 B.四边相等的四边形是菱形 C.对角线
在日常生活中我们常接触到许多含氮的物质，如：N2、NO2、NH3、NO、N2O3、N2O4、NaNO2、NH4NO3，则这八种物质中氮元素显示的化合价共有 A.4种
+
=-1.