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

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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.

单项选择题

计算机图形系统除具有计算、输入、输出功能外还具有哪两个基本功能（） A. 存储、交互 B. 存储、反馈 C. 反馈、显示 D. 缓存、交互