单项选择题

根据国内外的社会调查表明，在人类死亡原因中有50%是由（）引起的。

A.遗传因素
B.社会因素
C.医疗条件
D.不健康的生活方式

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单项选择题

在全人口中，智力分布基本呈两头小，中间大的常态分布。
A、正确
B、错误

多项选择题

What can you infer from the title of this article: “Why diversity matters: the importance of racial and ethnic equality in conservation”?
A、The writer argues the importance of racial and ethnic diversity in the article.
B、The writer thinks whatever diversity is important in the article.
C、The writer thinks racial and ethnic equality are important in conservation.
D、The writer discusses the reasons why racial and ethnic equality are important.