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什么是“所罗门4组控制实验”？其特点是什么？

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突发事件的报道需要注意哪些问题？

Which of the following is the viewpoint of scientists nowadays according to the man？
[A] About half of the researches about peoples' origins are inaccurate.
[B] Some of the early humankind lived on farming.
[C] Human beings originate from the different geographical locations.
[D] The issue of the geographical "origins" of a group of peoples is wrong.

Paragraph3____________
A OngoingResearch
B ExtensionofUse
C RobotHeroes
D GreaterReliability
E FallingDemand
F HiddenDanger

What did the manager mean by saying "Hockey and the International Hockey Federation are finished"？ (Line 5, Para. 2)
[A] His team would no longer take part in international games.
[B] Hockey and the Federation are both ruined by the unfair decisions.
[C] There should be no more hockey matches organized by the Federation.
[D] The Federation should be dissolved.