单项选择题

The elapsed time of the fastest transatlantic crossing mentioned by the author was 13 days and ______.

A．11.5 hours
B．7.5 hours
C．7 hours
D．4.5 hours
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单项选择题
Which of the following is true of the people in small towns many years ago
A．They used to stay home from church on Sundays.
B．They knew each other well.
C．Most of them prepared to live in big cities.
D．They liked to tell jokes among themselves.
单项选择题
What is the main subject of the passage
A．A solution to man's food problem.
B．A solution to the population problem.
C．Advantages of soybean.
D．How to develop good eating habits.
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