单项选择题

The word "enervated" in the first paragraph probably means ______.

A．weakened.
B．demolished.
C．vitalized.
D．enlivened.
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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
It can be inferred from the first paragraph that ______.
A．climate scientists are contemptuous of weather forecast.
B．it is a venture to forecast what weather is like tomorrow.
C．Schar has the audacity to do what others seldom did.
D．Schar has made gloomy predictions on future weather.
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