LEAVE 语句是结束整个循环，而ITERATE 语句只是退出当前循环、然后重新开始一个新的循坏。
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MySQL常用的循环语句有WHILE语句、REPEAT语句和LOOP语句。
A. 对
B. 错
REPEAT语句首先执行语句，然后判断条件是否为真，倘若为真则继续循环。
A. 对
B. 错
conversation 1
A. Onthephone.
B. Inthestreet.
C. theman'soffice.
D. inthewoman'soffice.
conversation 1
A. Theydidn'tarriveontime.
B. Theywereallmoldyandeatenbybugs.
C. 50%ofthemoldymushroomswereeatenbybugs.
D. Somewerehalf-eatenbybugsand20%weremoldy.
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