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

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

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

单项选择题

A teacher can develop proper attitudes of students through all the following factors except _________.

A．social studies
B．science matters
C．the very atmosphere of the classroom
D．criticism of children's behavior