单项选择题

The purpose of Emily Rosa% experiment was ______.

A．to see why TT could work the way it did
B．to find out how TT cured patients' illness
C．to test whether she could sense the human energy field
D．to test whether a human energy field really existed

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热门试题

单项选择题

It can be inferred that railroad refrigerator cars came into use ______.

A．before 1860
B．before 1890
C．after 1900
D．after 1920

单项选择题

Which of the following statements is supplied by the passage

A．Tin cans and iceboxes helped to make many foods more widely available.
B．Commercial ice factories were developed by railroad owners.
C．Most farmers in the United States raised only fruits and vegetables.
D．People who lived in cities demanded home delivery of foods.