A:Many hands make light work
B:Something is better than nothing
C:The more the merrier
D:The sooner begin, the sooner done
我们用显微镜观察洋葱表皮细胞,若目镜不变,先用10×物镜,后转换为40×物镜,则视野中( )
右图为生物膜简明结构模式图,a、b表示两种物质,有关说法正确的是( )
She _____ some of the food for her husband and went out.