下列各粒子结构示意图中，表示阳离子的是 （ ） A． B． C． D．
Let’s _________.
We play games _____ Tuesday afternoon.
Your ruler is 10 _______. A. mm B. cm C. m
Tom is 160cm tall. Sarah is 157cm. So _______ A. Tom is taller than Sarah. B. Tom is shorter than Sarah C. Tom is 3cm shorter than Sarah.
One meter is_______ centimeter. A. 10 B. 100 C. 1000
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