21.61. A: The dinner is on me today.
B: Come on. We are all students. You don’t have to do it.____
(A) That’s not the point. (B) There’ll be the devil to pay.
(C) Let’s go Dutch. (D) Don’t bark up the wrong tree.
28.68. A: I’m hungry. Let’s have lunch. B: OK. What do you want to eat?
A: Why don’t we have Italian food? B:____
(A) It’s a good restaurant. (B) Nice talking to you. (C) What do you like? (D) That sounds great.
Chinese is the most widely spoken language in the world. There is an increasing number of U.S. students who are learning the 71 . As China's influence grows, Chinese 72 may have greater opportunities. The number of schools where Chinese is taught has grown, according to a 2009 report. Ten years ago, about 300 schools had Chinese programs. 73 , about 1,600 schools teach Chinese. Some U.S. schools are working 74 the Chinese government and the College Board, a not-for-profit educational group, to bring Chinese teachers to this country. Teachers can 75 in the U.S. for one to three years. Instructors give lessons in their language and teach things about China.
【題組】71. (A) language (B) leadership (C) lesson (D) lighthouse
Scientist Paul Johnson and his team did a research on the result of feeding a lot of junk food to some rats. They had a serious goal: to try to understand how parts of the brain play a role in obesity. (Obesity is the condition of being very overweight, which has been linked to a variety of health problems.) The scientists observed that the more junk food the rats ate, the more they wanted to eat—a behavior very similar to that of rats addicted to heroin, a dangerous drug. Johnson told Science News the experiment shows that the brain chemistry of obesity and drug addiction may be quite similar.
In their experiment, Johnson and his team studied the “pleasure center” of rats’ brains. The pleasure center is a complicated network of nerve cells. Together, these cells work as the body’s reward system. If the animal exercises or eats, the cells reward the animal by releasing chemicals into the body that make it feel good. And when the body feels good, the animal—or person—will want to do the behavior again. Pleasure centers can release these chemicals in less healthy ways, too. Drugs like heroin can cause the pleasurable chemicals to be released.
For the experiment, Johnson fed foods like cheesecake, bacon and Ho Hos to one group of rats. These foods are all high in calories and high in fat. Another group of rats received a regular, nutritious diet. The rats that ate junk food started to eat more and more.
【題組】76. What controls rats’ desire of eating?
(A) brain (B) exercise (C) heroin (D) obesity
37.【題組】77. What is the result to the rats that are fed with junk food?
(A) They live longer. (B) They are addicted to heroin.
(C) They want to eat more junk food. (D) They change to a regular, nutritious diet.