题目内容

实现中华民族伟大复兴,最根本的力量在于人民。

A. 对
B. 错

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函数f(x)在点x=a处的左右极限存在且相等，则它是函数在x=a处连续的

A. 充分不必要条件
B. 必要不充分条件
C. 充分必要条件
D. 既不充分也不必要条件

函数f(x)在点x=a处有定义是函数f(x)在点x=a处连续的

A. 必要不充分条件
B. 充分不必要条件
C. 充分必要条件
D. 既不充分也不必要条件

1. There’s a man at the reception desk who seems very angry and I think he means______ trouble.

A.making
B. to make
C. to have made
D. having made

His eagerness _______ was quite obvious.

A. returning to work
B. to return work
C. to return working
D. to return to work