I have no doubt that he will pass the ex

设函数y=y(x)由方程x³-ax²y²+by³=0所确定，要使x=1是y=y(x)的驻点，且曲线y=y(x)通过点(1，1)，则（）。

A．a=2，b=3

B．

C．

D．a=-2，b=-3

阅读理解。

1．If Joe wanted to buy the cheapest ticket for Peak Day, he could book (预定)one during            . [ ]

A．Pre-sale Ⅰ

B．Pre-sale Ⅱ

C．Pre-sale Ⅲ

D．Expo Session

2．On March 1, 2010, Sue bought two Standard Day tickets for her parents. She paid             for them.[ ]

A．￥380

B．￥300

C．￥260

D．￥180

3．It cost Thomas ￥160 to get a ticket for Standard Day. He probably bought it on            .[ ]

A．April 23, 2009

B．August l, 2009

C．February 2, 2010

D．May 20, 2010

4．Kathy spent 900 yuan on a ticket for Shanghai Expo. Her visit can last             days.[ ]

A．one

B．three

C．seven

D．ten

5．Visitors to Shanghai Expo could buy             tickets only after May 1, 2010.[ ]

A．morniing

B．afternoon

C．evening

D．midnight

计算：x·2x²·3x³·4x⁴·5x⁵·6x⁶

I don’t think English is         a language as Russian.

A．more difficult

B．as difficult as

C．such difficult

D．as difficult

在统计数据搜集中，我国的农产量抽样调查常用的方法是（）

A．直接观察法 

B．报告法 

C．采访法 

D．登记法