单项选择题

The overall effect of this passage is likely to make the reader feel ______.

A．enthusiastic about biotechnology
B．very worry about genetic engineering
C．reluctant to try new plant combinations
D．alarmed about limitless experiment

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单项选择题

The word boon at the end of paragraph 1 is closest in meaning to ______.

A．success
B．accomplishment
C．dream
D．benefit

单项选择题

From the passage we understand that conventional plant breeding produced ______.

A．a potato-tomato hybrid
B．new plant technology
C．self fertilizing
D．less dramatic results than the new technology