Yan tries to encourage more women to study science. In her eyes，there is no difference between men and women in the scientific fields. Women can work as excellently as men and live the way they choose.

1. Which of the following best explains "prominent" underlined in paragraph 2?

A. Excellent. B. Interesting.

C. Strange. D. Educational.

2. Why does Ning Yan prefer to work at night?

A. She is used to working at night.

B. She is busy during the daytime.

C.It is quiet not to be bothered.

D. The research requires doing at night.

3. What made Yan want to be a biologist?

A.Her research. B. A classic novel.

C.Her professor. D. Her dream.

At present，there are over 36,000 McDonald's ted out as a small one. The McDonald brothers, Dick and Mac，opened the first McDonald's in San Bernardino，California in 1948. The menu included hamburgers，soft drinks，pie， French fries, milk，coffee and milkshakes. Ray Kroc，a travel salesman, visited the store and became interested in it. The brothers said that they hoped to open stores in the whole country, and then Kroc became their first franchise agent (特许经销商）in 1954. Kroc opened up a restaurant for McDonald's on April 15,1955. That store came with a lot of difficulties in the beginning.

After dealing with the difficulties，McDonald's started to spread to all over the United States. The McDonald brothers wanted to show their Speed Service System-what we call fast food. Customers were served at large windows in the front of the building. The houses of the first restaurants were red and white with two golden arches (拱）on the side to make the roof look less flat.

The McDonald's menu in 1977 shows how 'different its food choices are from today. What's more, today McDonald's have digital screens to show menus again and