单项选择题

Which of the following statements is true

A．Diseases caused by bacteria and viruses were incurable in 1900.
B．Bacteria and viruses are the main causes of death today.
C．Medicines for curing pneumonia were not available in 1900.
D．Pneumonia caused as many deaths in 1900 as cancer does today.

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单项选择题

Life expectancy in the last paragraph most probably means ______.

A．the kind of life that a person may expect to live
B．the mode of life that a group of people have lived
C．the length of time that a person or an animal has lived
D．the length of time that people may expect to live

单项选择题

According to Paragraph 1, health and wellness ______.

A．can be used interchangeably on all Occasions
B．are different in that the latter has a broader sense
C．had the same meaning in the past
D．both refer to the state of your well-being