如图,利用两块相同的长方块测量一张桌子的高度,首先按左图方式放置,在交换按右图方式放置,测量数据如图,则桌子的高度是( )厘米.
A:73
B:74
C:75
D:76
A. He is playing ping-pong.
B. They are climbing trees.
C. She is singing and dancing.
D. I'm doing my homework.
E. It's running on the grass.
常见金属R与硝酸银溶液反应的化学方程式为R+3AgNO3=3Ag+R(NO3)3,有关该反应的说法正确的是()
—I always get ______ before the exam and I can't go to sleep!
—You should relax yourself.
The monkey is better at ____ (climb) than that one.