题目内容

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。

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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

On what days do British people like to write cards?

A. Father's Day and Mother's Day
B. Christmas
C. Birthday
D. All of the above