解方程（x2-1）2-5（x2-1）+4=0．

张安世是汉武帝时的重臣。下列史实，张安世不可能经历和做到的是

A．同主父偃讨论“推恩令”的问题

B．为司马迁撰写《史记》提供素材

C．用“蔡侯纸”上书汉武帝，痛陈王国问题的危害

D．陪同汉武帝送别张骞出使西域

2011年，长沙市 * * 票销售达多少亿元？

For this part, you are allowed fifteen minutes to write a letter. Suppose you are Zhang Ying. Write a letter to Xiao Wang, a schoolmate of yours who is going to visit you during the weeklong holiday. You should write according to the suggestions given below.

1) Welcome him;

2) Give some suggestions on how he spends the holiday;

3) Something detailed to be paid attention to.

釉质新生线可见于

A．恒尖牙

B．恒切牙

C．前磨牙

D．第一恒磨牙

E．第二恒磨牙

如何预防子宫内膜异位症的发生