单项选择题

A．Thailand is Asia's biggest producer of opium.B．Most o……

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 Asi

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单项选择题Which of the following is common to Roger Bacon, Francis Bacon and Descartes

A．Speculations about gunpowder, flying machines, etc.
B．Devotion to Aristotle' s theories.
C．Belief that observation and experiment are the key to understanding nature.
D．Important inventions.

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

单项选择题If refrigerated, USDA eggs will remain good for ______ weeks from the date stamped.

A．four to five
B．three
C．two to three
D．six to seven

单项选择题How many types of motors are generally used in the shaver

A．Two.
B．Three.
C．Four.
D．Not known.

单项选择题According to the passage, which is the principal energy source of home heat

A．Wood.
B．Coal.
C．Natural gas.
D．Petrol.