D. The Skylab astronauts made great contributions to biomedical research.

　　参考答案C篇 29-32 ACCB

　　D

　　Suppose you are thinking about attending college in the United States, but perhaps you might not be ready for a university with a four-year program. About 88,000 international students have found solution. They are attending U.S. community colleges. Such colleges are sometimes called junior colleges. They offer two years of education above the secondary or high school level.

　　Community college students can choose from subjects like medical assistance, computer science or law. At the end of their study program, they receive a document of completion, called a certificate. Some students work toward an associate degree in traditional academic subjects like science or history. After getting it, the students can move on to a four-year college or university. They may have only two years of study left before they receive a bachelor’s degree.

　　Many educational experts agree that saving money is the major reason to consider a community college. The American Association of Community Colleges (AACC) says that a public two-year college costs 3,000 dollar a year on average. That is true if the student lives in the same state as the school. A student at a four-year public college may pay 8,500 dollars a year for classes and user fees. That does not include books and other materials.

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