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The researchers are already working with food companies, kee......

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A．The experiment will take a long time.B．The students should count their time in the lab.C．Dr. Walters teaches biology in the afternoon.D．Biology lab is open one hour every afternoon.
A．The experiment will take a long time.
B．The students should count their time in the lab.
C．Dr. Walters teaches biology in the afternoon.
D．Biology lab is open one hour every afternoon.
填空题
Trapped in this way, individual colonies cannot spread and rapidly run out of nutrients
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