三角形木板砍掉一个角，一定变成4个角．______．
三角形木板砍掉一个角，可能变成3个角或4个角，不全是4个角；
故答案为：×．
.－Who taught _____ to swim?
－I learned it by _____.
A．your, my
B．you, me
C．yourself, myself
D．you, myself
— _____ did he hold the record for hiccupping?
— For twenty years. [ ]
A. How long
B. How many
C. How much
D. How often
