题目内容

-How long will your trip take?-( )

A. It will start tomorrow.
B. It has two days.
C. It took two weeks.
D. It will take about two weeks.

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从键盘输入5位学生的信息，包括：学号、姓名、性别、年龄和成绩；并统计这5位学生的平均年龄、平均成绩和不及格的人数。

以下说法错误的是。

A. 电压源空载时,电源输出电压等于电源电动势
B. 理想电流源不允许端子短路
C. 理想电压源输出的电流受外电路的影响
D. 理想电流源的内阻无穷大

When she heard that her mom was seriously ill, she could hardly______ her tears.

A. keep back
B. keep down
C. keep on
D. keep away

When I went to see my boyfriend's parents for the first time, they welcomed me______.

A. with open arms
B. with open eyes
C. with open mind
D. with open smile