单项选择题

People born in autumn live longer than those born in spring because()

A. a mother giving birth in spring has less nutrition during her pregnancy
B．a mother givens; birth in autumn eats more vitamins during the last stage of her pregnancy
C．a baby born in spring receives no protection from infections
D．a baby born in autumn is never subject to any infections

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单项选择题

When the two students dropped out, no one took much notice because()

A. they had long lost heart in class performance
B. they were absent from class too often
C. they didn’t get on well with other students
D. they were so much cut off from the rest of the class

单项选择题

The main idea of paragraph 3 is that()

A. workers now take examinations
B. the population has grown
C. there are only written exams today
D. examinations are now written and timed