单项选择题

What are some of the problems that Chromium Ⅵ can cause（）

A．Cancer.
B．Asthma.
C．Tumors.
D．All of the abov

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单项选择题
How much Chromium Ⅵ is a safe amount（）

A．No safe level.
B．6 %.
C．It is safe.
D．No one knows.
单项选择题
Ronald Musoke is a student at （）

A. Uganda College
B. College of Marin
C. Mills College
D. Mudd College
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