According to the passage, why is plankton considered to be more valuable than land grasses？
A. It's easier to cultivate.
B. It produces more carbohydrates.
C. It does not require soil to grow.
D. It is more delicious.
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听力原文：What is the conclusion drawn by the Department of Education？
(29)
A. Young Americans should read more for pleasure.
B. There too many non-English speaking immigrants.
C. Reforms should be carried out in high schools.
D. People should complete college study if possible.
【B1】
A. separate
B. invite
C. gather
D. long
What does the passage mainly discuss？
A. The relation between culture and invention.
B. The transmission of human culture.
C. The history of human civilization.
D. The biological evolution of man.
听力原文：What kind of activity is defined as complex activity？
(28)
A. Carrying out reading activities.
B. Comparing newspaper remarks.
C. Finding information in a book.
D. Answering written questions.
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