单项选择题

Before Venter’s study, it was thought that

A. nutrient levels depended on the number of organisms that eat carbon.
B. certain viruses keep microbe levels under control.
C. bacteria might be responsible for climate change.

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热门试题

单项选择题

Synthetic Genomics, owned by Venter, hopes to

A． make fuel from carbon dioxide.
B． produce hydrogen.
C． discover more species of microbe.

多项选择题

The traveller found New Yorkers to be

A．kind.
B．rude.
C．pushy.
D．helpful.