第1题
A.Boundaries where two pieces of the Earth's outer shell diverge.
B.Zones where one tectonic plate moves under another.
C.The expansion of oceans and other bodies of water.
D.The existence of a land bridge that connected continents.
第2题
A.To emphasize the negativity of the public's reaction to a certain theory.
B.To complain about the behavior. of the scientific community.
C.To introduce a reason for a shift in scientific opinion.
D.To ask the students their opinion of a theory he described.
第3题
A.He does not want the students to ask any more questions.
B.He does not think the idea is worth spending time talking about.
C.He wants the students to accept the idea even if they do not understand it.
D.He thinks the students are familiar with the concept he is discussing.
第4题
A.To pick up a letter of approval for studying abroad.
B.To ask for assistance with changing her major.
C.To receive advice on how to learn a foreign language.
D.To get information on study-abroad opportunities.
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