当光速通过豆浆时，可观察到丁达尔效应，表明豆浆是 A．乳浊液． B．溶液 C．悬浊液 D．胶体
若x，y∈R，且满足+= 6，则x + 2 y的最小值是 ，最大值是 。
Finding no students in the lecture hall, Prof．Flynn realized that he came ______ early. A．very B．much C．too D．far
如图所示，为“探究加速度与力、质量的关系”实验装置图。图中A为小车，B为砝码及砝码盘，C为一端带有定滑轮的长木板，小车通过纸带与电火花打
Life is like a long race _____we compete with others to go beyond ourselves. A. why B. what C. that D. where
At last he some good ideas about their volunteer day． A．thought out B．come up with C．fixed up D．put up
24．认真阅读下面的材料，根据自己对材料的感悟和联想，选一个合适的角度写一篇作文。 2015年圣诞节来临时，中国内地许多地方的人士用各种不同的
I think it’s not polite to laugh ______ others. A. in B. at
