单项选择题

Identical twin sisters have led British scientists to a breakthrough in leukemia research that promises more effective therapies with fewer harmful side-effects.

A．administers
B．nurtures
C．inspires
D．ensures
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单项选择题
An outbreak of swine flu outside of Mexico City was blamed for the deaths of more than a hundred people in April 2009.
A．attached to
B．ascribed to
C．composed of
D．related to
单项选择题
When a forest goes ablaze, it discharges hundreds of chemical compounds, including carbon monoxide.
A．puts out
B．passes off
C．pulls out
D．sends out
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