[单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. The effects of the flood. B. The prices of fruits and vegetables. C. The cause of the flood. D. Floods of the past twenty years.
参考答案:A 答案解析:[听力原文]
W：This has been the worst flood for the past 20 years．It has caused much damage and destruct
第29题: [单项选择]若有定义：float x=1.5；int a=1，b=3，c=2；则正确的switch 语句是( )。 A. switch(x) B. switch((int)x); C. switch(a +b) D. switch(a+b) 参考答案:C 答案解析:[解析] switch 后的括号中只能是整型或字符型表达式，选项A中使用的是浮点型变量x，故不正确。选项B在switch的括号后面多了一个分号，故也不正确。switch的case标号后只能是常量或常量
