单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A. Rich agricultural lands. B. Busy truck traffic.
C. Rolling hills and mountains. D. Cattle grazing on the grasslands.
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单项选择题
A. They are too busy these days. B. People in charge are on business.C. These are not their fault. D. The woman should blame on herself.
A. They are too busy these days.
B. People in charge are on business.
C. These are not their fault.
D. The woman should blame on herself.
填空题
Some people boost genetically modified crops on the condition that these altered plants contain______
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