单项选择题

According to the passage, biotech can help _________.

A．produce anti-virus crops
B．create more varieties of foods
C．produce beta carotene and Vitamin-A more efficiently
D．produce foods that contain more nutrients needed by human beings

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热门试题

单项选择题

It can be inferred from the passage that _________.

A．genetically modified foods contain more vitamin than ordinary foods
B．the U.S. is the country which uses genetically-modified foods the most
C．genetically-modified foods are wildly used though they are still in debate
D．genetically-modified foods are more welcomed in poor countries than in rich countries

单项选择题

The author's attitude toward genetically-modified foods is _________.

A．indifferent
B．cautious
C．disapproving
D．optimistic