Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. According to the passage, when are children first expected to study hard（）
A. Before 6 years of age.
Between 6 and 10.
C. After l0 years of age.
D. After 12 years of age.
查看答案
43（）
A. falls
B. retires
C. drops
D. happens
46（）
A. have originated
B. be originating
C. be originated
D. originate
38（）
A. label
B. symbol
C. mark
D. cut
Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. The conversation is mainly about （）
A. a new type of telephone.
B. the cost of telephones.
C. some features of the magazine.
D. the readership of the magazine.
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