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【判断题】
f(x)在[a,b]上连续是 存在的充要条件。()A.
正确
B.
错误
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举一反三
【单选题】We must make ___ to the public that something should be done to stop pollution.
A.
what is clear
B.
it is clear
C.
it clear
D.
that clear
【单选题】Java语言中，String str=”123456789”，System.out.println(str.indexOf(“5”))，输出结果是（ ）。
A.
6
B.
5
C.
4
D.
3
【单选题】听力原文：W: I'll send Jane a new American stamp. M: I'm sure she'd be pleased to get it. She has a collection of stamps from foreign counties. What do we learn about Jane?
A.
She's going to America.
B.
She has travelled abroad.
C.
She likes collecting stamps.
【简答题】We ____________ ask them to dinner while they're over here. I'm sure they'll be delighted.
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