单项选择题

The most suitable title for the passage would be ______.

A．The Cell Lines.
B．The Stem-cell Research.
C．The Dangers of Delay.
D．Costs on American Patients.
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单项选择题
It can be inferred from the last paragraph that other historians ______.
A．follow in the footsteps of Nazism and communism.
B．are very cautious in linking Western culture and modernity.
C．focus their attention on relatively specific topics.
D．hold drastically different views from Landes.
单项选择题
In discussing Landes's work, the author's tone is ______.
A．enthusiastic,
B．skeptical.
C．reproachful.
D．matter-of-fact.
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