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单项选择题
On which of the following aspects does Frisen disagree with some radicals
A．Whether research should be done on embryonic stem cells.
B．Whether research should be done on adult stem cells.
C．When should people expect a drug for Parkinson’s.
D．When should clinical trials of stem-cells research begin.
单项选择题
The main difference between the Earth’s atmosphere and the simulated one is ______.
A．their size.
B．their content.
C．their height.
D．their density.
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