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

According to the author competition differs from conflict in that______.

A．it results in war in most eases
B．it induces efforts to expand territory
C．it is a kind of opposition among social entities
D．it is essentially a struggle for existence

单项选择题

The passage is probably intended to answer the question ______ .

A．Is war inevitable
B．Why is there conflict and competition
C．Is conflict desirable
D．Can competition lead to conflict