单项选择题

A morpheme is the minimal contrastive unit in the writing system of a language. ( )
A. 对

B. 错

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单项选择题

Why did the state of California impose a monthly three-dollar tax on “foreign miners” in the middle of the 19th century?
A、Foreign miners were much richer than the local miners.
B、Foreign miners were considered economic competitors.
C、Because three dollars is nothing to the wealthy foreign miners.
D、They want to protect the environment.

单项选择题

所有人们持有不同意见的事情都可以构成适当的、可以进行探究的问题。（）

A．对
B．错