单项选择题

According to the passage, all of the following are true, but _________.

A．moods can have an influence on people's emotions
B．aerobic exercise can help people better use oxygen
C．swimming, walking, or running is an efficient cure for a bad mood.
D．scientists have provided people with many tranquilizers

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单项选择题

Which of the following best describes the organization of this passage

A．A procedure is explained and its significance is emphasized.
B．A problem is examined and solutions are given.
C．Two contrasting views of a problem are presented.
D．Recent pharmacological advancements are outlined in order of importance.

单项选择题

According to Mr. Gretz, the present sum of money will enable the scientists to provide _________.

A．less than 3 percent of the EEC's needs before the year 2020.
B．3 percent of the EEC's needs before the year 2020
C．a little more than 3 percent of the EEC's needs after the year 2020
D．only 3 percent of the EEC's needs even after the year 2020.