单项选择题


Questions 17-20 are based on the following dialogue. You now have 20 seconds to read Questions 17-20.
What is the main topic of this conversation

A．Lunch.
B．An exam.
C．A class.
D．A trip.
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单项选择题
What was the purpose of the professor’s experiments
A．To find out how clever monkeys were.
B．To test the intelligence of different animals.
C．To compare the difference between man and the monkey.
D．To find out how monkeys search for food.
单项选择题
Which of the following is not true of the Space Shuttle Columbia
A．It was the first rocket ever made in history.
B．It did the first flight in 1981.
C．Its first flight was of great importance in the development of space exploration.
D．It can only stay in space for about a week now.
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