最少用几个完全一样的直角三角形可以拼成一个长方形[ ]
A.2
B.3
C.4
答案：A
- The speaker is a tall man with glasses.
- Then it_____ be Mr. Smith, who is short and thin.
A．wouldn't
B．won't
C．mustn't
D．can't
地球的半径为6370千米，乒乓球的半径约为2厘米，则乒乓球的半径是地球半径的（ ）分之一．
