填空题

There was something disastrous happening on an evening of mid-July in 1944: two ships, fully loaded with ammunition, were exploded in a Navy base near San Francisco.

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NG
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Hundreds of people who were killed or injured in the explosion were all African Americans.
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In the third paragraph it is mentioned that by means of science ______.are analysed and studied.
A．the ways in which cells formed
B．changes in organic life
C．the main ways in which organisms develop
D．processes on which organic life depends
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