单项选择题
A.They cost less. B.They tasted better. C.They were in fashion. D.They were widely advertised.
A.Their performance may improve. B.Their immune system may be reinforced C.Their blood pressure may rise all of a sudden. D.Their physical development may be enhanced.
A.They often feel insecure about their jobs. B.They are unable to decide what to do first. C.They are incompetent to fulfill their responsibilities. D.They feel burdened with numerous tasks every day.