What aspect of the fossil record is this lecture mainly about？
A. The impact hypothesis
B. Mass extinctions
Climate change
Diversity in species
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What is the impact hypothesis？
A. The theory that the continents drifted and collided with each other
B. The idea that volcanic eruptions disrupted the climate worldwide
C. The view that a lightening storm caused a global fire
D. The premise that an asteroid crashed, blocking the sunlight on Earth
What will the man probably do during the next class？
A. He will ask fewer questions.
B. He will tape record the lecture.
C. He will refer to the outline in the book.
D. He will participate more in the discussion.
What was surprising about Thrasher's study？
A. The size of the study, which included 1300 gangs
B. The excellent summary by the student who located the research
C. The changes that were reported in the history of gangs
D. The fact that gang activity has been prevalent for so long
电子商务的交易类型主要包括_______。
A. 企业与个人的交易(B2C) 方式、企业与企业的交易(B2B) 方式
B. 企业与企业的交易(B2B) 方式、个人与个人的交易(C2C) 力式
C. 企业与个人的交易(B2C) 方式、个人与个人的交易(C2C) 方式
D. 制造商与销售商的交易(M2S)方式、销售商与个人的交易(S2C) 方式
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