多项选择题

内碎屑根据其颗粒直径大小可以划分为哪些级别？

A．砾屑
B．砂屑
C．粉屑
D．泥屑

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单项选择题

Which one is the correct answer?
A.
He leaves for school at 8. B.
He is studying in Paris.
C.
He is doing very well.
D.
He likes his school.

单项选择题

汉字学的奠基之作《说文解字》，是（）创作的。

A.许慎
B.仓颉
C.李斯
D.斯