充油试验时跳闸电磁阀是否动作跳闸？
参考答案：
不动作.
设a为实数，函数f（x）=x2+|x-a|+1，x∈R．
（Ⅰ）若f（x）是偶函数，试求a的值；
（Ⅱ）求证：无论a取任何实数，函数f（x）都不可能是奇函数．
The pretty girl is known ________ the public ________ a little film star ________ her excellent performance in a film.
A．in; as; with
B．to; as; for
C．among; with; in
D．by; for; because of
