Which of the following statements is TRUE？
A. The subjects in a cross-sectional research are not of the same age group.
B. The methods of study in longitudinal research will not change over time.
C. Longitudinal research is reliable only in seeking understandings of the effects of early experiences on later development.
D. Cross-sectional methods are not usually adopted in studying, for example, the changes in intelligence over a thirty-year period.
查看答案
What is the main idea of the first paragraph？
A. Make a comparison between tapping the consumer market and business-to-business.
B. The shift of the focus of business on Web.
Consumer market is inferior to business-to-business.
D. Business-to-business marketing on the Internet can make more money.
听力原文：M: There's something different about Paula, but I can't put my finger on it.
W: I heard that she had had cosmetic surgery. Want to bet she had a nose job？
Q: What probably happened to Paula？
(13)
A. She lost a finger.
B. Someone hit her in the nose.
C. She became a surgical nurse.
D. She had an operation on her nose.
Where is paper first made？
A. China.
B. Japan.
C. Germany.
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