下列句子，“于”为介词引进行为主动者的一句是（）A小子识之，苛政猛于虎也。 B卻克伤

阅读理解。

    What's the most important thing for you to have in your life? Someboy mentions hard-work, others

suggest knowledge, love and luck.

    If you arrange the 26 English letters alphabetically (按字母表的顺序) and use numbers to represent

each of them, for example, 1 for a, 2 for b, 3 for c…, you can change an English word into a number.

So hard-work becomes 8+1+18+4+23+15+18+11=98, meaning 98 is its mark; knowledge:

11+14+15+23+12+5+4+7+5=96, while love:12+15+22+5=54, and luck: 12+21+3+11=47, a small mark.

None of these words can give one a full mark. What about money or prayer (祈祷)? They can't, either.

    Then what else? Don't be worried. You can always find an answer to a problem in your life, when

you change your way of looking at things or doing things, or your attitude (态度).Yes, attitude is the

word. See for yourself: attitude: 1+20+20+9+20+21+4+5=100, a full mark.

    Different attitudes lead to different courses of life. Most times people hope for a better life. It is possible

that one will have a change for the betterr after one has changed one's attitude.

    When you change your manner and became friendly towards others, you'll meet more smiling faces

towards you.In the same way, if you take a positive (积极地) attitude towards failure (失败), you'll find

it's also rewarding though it has caused you losses.

1. In the writer's opinion, what is the most important things in a person's life? [ ]

A. Hard-work.

B. Knowledge.

C. Money.

D. Attitude.

2. According to the passage, if you meet with problems, the best way out is to ______. [ ]

A. ask for helpf from others

B. say your prayers to God

C. change your attitude

D. try maths-solving methods

3. From the passage we can learn that ______. [ ]

A. diffrent attitudes come from different courses of life

B. mathematics can solve every problem easily in our daily life

C. failure sometimes can bring you good if you take a positive attitude

D. none of the English words except "attitude" equals to 100 or more

无线电频谱可以依据（）来进行频率的复用。

A、时间

B、频率

C、空间

D、编码

有如下类声明：
class XA
int x;
public:
XA(int n) x=n;
;
class XB: public XA
int y;
public:
XB(int a, int b);
;
在构造函数朋的下列定义中，正确的是( )。

A．XB::XB(int a，int b): x(a)，y(b)

B．XB::XB (int a，int b):XA(a)，y(b)

C．XB::XB(int a，int b): x(a)，XB(b)

D．XB::XB(int a，int b):XA(a)，XB(b)

拮抗肝素过量的药物是

A．维生素K
B．维生素C
C．硫酸鱼精蛋白
D．氨甲苯酸
E．氨甲环酸

下班做到“五不走”的内容是什么？