It took ______ for the world to increase its population from 1 billion to 4 billion.
A. 100 years
B. 145 years
C. 1975 years
D. Over two million years
In the third paragraph, the author is trying ______.
A. to be critical of custom
B. to say that anthropology is more important than psychology
C. to strengthen the role custom plays in experience and belief
D. to draw our attention to the importance of custom
在Excel中，要清除选定单元格中的内容，最快捷的操作是( )
A. 选择“编辑”菜单中的“清除”子菜单中的选项
B. 按Delete键
C. 单击工具栏中的“剪切”按钮
D. 选择“编辑”菜单巾的“删除”命令
在Excel工作表中，在单元格C1中先输入数字0，再按空格键，然后输入3/9，此时，单元格C1显示的是( )。
A. 1/3
B. 3/9
C. 0.33
D. 0.3333
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