下列各组物质或其主要成分属于同一种物质的是（ ）。A．氢氧化铁、铁锈B．石灰石、生石灰C．熟石灰、氢氧化钙D．纯碱、烧碱
---The bag looks very heavy. Do you need a hand? ---________. I can make it. A.No, thanks B.All right C.Never mind D.Yes, I do
— Can you give me the right answer? — Sorry, I ＿＿.Would you repeat that question? A. hadn’t listened B. haven’t listened C. don’t listen D. wasn’t listening
仿照例句续写一个句子（3分） 例句：人生既有四季，便自有寒来暑往，草荣草枯，花开花谢。 人生既如登山，________________，_______________，________________
2 sin30°－3 tan 45°＋4 cos 60°；
自从玛丝洛娃被判罪，人生陷入低谷后。聂赫留朵夫多次帮助她改善处境。请简要叙述其中最主要的三次。
His son often ______with me after school. A. walks to home B. walk home C. walk to home D. walks home
Farmers now more government help not only of money but also of science and technology on farming. A．call on B．call for C．stick to D．live on
的图象经过点
，那么
的值是（ ）
B．
C．
D．6 