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
All of the following are the consequences of the research slowdown EXCEPT ______.
A．the negative impact on technical advancement.
B．the detriment to the culture of inquiry.
C．the loss of one's productivity.
D．the collapse of American dreams.
单项选择题
According to Landes, some countries are so poor mainly because ______.
A．they lack work ethic.
B．they lack rationality.
C．they are scientifically backward.
D．they are victimized by colonists.
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