According to the recommendation of the CDC, when should people receive vaccinations in America？
A. People should receive a vaccination one or two weeks earlier before influenza activity.
B. People should receive a vaccination before the influenza epidemic.
C. People should get flu shots in March when the influenza activity ends
D. People should get flu shots before October so as to develop antibodies
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就运动学习和锻炼动机而言，从表面上看，追求成功和逃避失败的倾向都能促进学生努力参与体育活动，并对学生心
According to Paragraph 3, which of the following is true of the clean car？
A. The appearance of the car is quite neat.
B. The car sends out no harmful gas.
C. The car is battery-powered.
D. The car can purify polluted air.
“有趣”不断地发展积累，由量变引起质变，由被动的、观赏性的兴趣转化为主动参与的兴趣，由不太稳定的愉悦倾向发
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