单项选择题

The relatively low income of the commercial farmers is mainly caused by ______.

A．their failure to produce enough food for sale
B．the high cost of farming
C．the competition from abroad
D．the excessive food production
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单项选择题
According to the passage, which of the following statements is CORRECT
A．Thailand is Asia's biggest producer of opium.
B．Most of the marijuana distributed to the U.S. comes from Columbia.
C．Coca leaf is mainly grown in South America.
D．Drugs are not grown in Central Asia.
单项选择题
As can be gathered from the passage, Aristotle's theories ______ in the Middle Ages.
A．were ignored by most scholars
B．hindered scientific progress
C．were declared as heresy
D．were basis of important discoveries
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