下列各小题中，p是q的充要条件的是 
（1）p:$\cos \alpha =\cos \beta$;q:$\sin \alpha =\sin \beta$；
（2）$p:\frac{f(-x)}{f\left(x\right)}=-1$,q:y=f(x)  是奇函数；
（3）$p:A\cup B=B,q:C_{U}B\subseteq C_{U}A$；
（4）P:m<2或m>6；q:y=x²+mx+m+3有两个不同的零点.

完形填空

先通读下面的短文，掌握其大意，然后在每小题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

    An old carpenter(工匠)was ready to retire(退休).His boss was 1 to see the good worker leave. He asked the carpenter if he could build just one more 2 . The carpenter said yes, but his mind was not on his work any more. He used poor materials and 3worked on the house. When the carpenter finished his work, the boss  4 the front-door key to him and said, "This is your house. It's a 5 for you."

    What a surprise! If he had known he was 6 his own house, he would have done it differently. Now he had to live in the house he poorly built.

    So it is with us. Sometimes we build our 7 carelessly. At important points we do not try our best. Then with a shame we look at the things we did. We find that we are living in the house we have poorly built 8we don't have a chance(机会)to make it all over again.

    Think of  9as the carpenter. Think about your life. Build it carefully and wisely. It is the only life you will ever build because life is a do-it-yourself project.

    Your life today is the 10 of  your attitudes(态度)and choices(选择)you made in the past. Your life tomorrow will be that of your attitude and choices you make today.

有史料记载，汉代“文帝之时，纵民得铸钱、冶铁、煮盐。”因而出现一些富商大贾“冶铸煮盐，财或累万金。”此现象说明，当时(　　)

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