单项选择题

When does the next train leave

A．7:58.
B．8:00.
C．8:18.
D．8:38.
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Which of the following does NOT help to separate the useful U-235 and nearly useless U~2387
A．The principle of gaseous diffusion.
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What call be inferred from the passage, according to the passage itself
A．The book is still a controversial topic.
B．The book enjoys high popularity among critics.
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D．The book advocates racism by itsel
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