单项选择题

According to Simon, the reason why people work is that ______.

A．they like belonging to work organizations
B．they can participate fully in society
C．they can fulfill their personal aims
D．they need money to survive

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单项选择题

It is implied in the passage that ______.

A．sugar planter imported mongooses to control rats
B．man should never kill animals
C．man has complete control over nature
D．upsetting the balance of nature can be troublesome

单项选择题

The phrase balance of nature in the first line means ______.

A．reducing the population of.predators and parasites
B．keeping the right number of animals for the right amount of food
C．keeping the ratio of small game to predators
D．driving animals to mass migrations