小明做口算训练，共50题，做错了5题．小明这次口算训练的正确率是______．

阅读与表达。

    November 24, 1859 was a special day in London. On the day, many Londoners rushed to a bookstore

to buy a book that was just published. The first printing of 1,250 copies sold out on the first day.

    The popular book was The origin of Species (《物种起源》) by British naturalist Charles Darwin

(1809-1882). In the book, Darwin argued that different forms of life could change over time because of

natural selection. This means that only those who are best suited to their environment will live and reproduce.

Darwin supported his arguments with examples he found during his around-the-world trip in the 1830s.

    The book laid the foundation of modern biology. It changed how other scientists understood the

appearance of life on Earth.

    A hundred and fifty years later, Darwin's theory (理论) of natural selection still has great influence in

the world of science. But some people have a question: since medicine and modern life have made people

healthier, are we still evolving (进化) by natural selection?

    The answer is yes, according to Stephen Sterns and his team of Yale University researchers. They did

a study on 2,238 women in the US. They found that shorter, heavier women have more children then

thinner, taller ones. This trend (趋势) runs among their female children and grandchildren. So if this

continues, women in 400 years will be about 2cm shorter and a kilo heavier.

    Sterns' findings are supported by other scientists. For example, John Hawks at the University of

Wisconsin, US and his team believe they have found nearly 2,000 gene variations (基因变异) in modern

humans. Those variations allow people to drink milk, fight disease and improve brain development.

1. Was The origin of Species a popular book? 

2. When was the book published?

3. What does natural selection mean?

4. Why does the writer introduce Sterns' findings in the passage?

5. Why is Darwin's theory of natural selection important? 

某计算机公司2007年的经营收入为1500万元，预计以后几年的经营收入的增长率相同，且2009年的经营收入达到2160万元，求这个增长率及2010年的经营收入．

Directions: Complete the following passage by filling in each blank with one word that best fits the context.

Last week I visited Plattsburgh State University (PSU). People had told me that it was a good college, but it was even  小题1: than I had expected.

Located in the small city of Plattsburgh, PSU is  小题2: nice-looking school. Inside, the buildings have signs to point you in the right direction if you don’t know  小题3: you are going.

The average class has 24 students. One thing I found interesting was that  小题4: you are a good note-taker, the professor will pay you to photocopy (复印) your notes for the rest of the class.

PSU offers a lot of majors, including art, history, science  小题5: nursing. All of these programs are especially designed  小题6: students to meet their future work needs. The school also has many academic programs, including an honors program .

PSU has many clubs, ranging 小题7: dance clubs to sports clubs. This school has a great reputation and offers a lot to  小题8: students. I think that PSU is certainly a college to consider.

法的构成要素包括( )。

A．法律规则

B．法律原则

C．法律程序

D．法律概念

公司各单位管辖的厂区/生活区等供车辆通行的单位内部道路以及通往作业现场的道路发生的车辆伤害事故，由（）组织调查。

A.公安部门

B.交通部门

C.安全管理部门

D.保险部门