单项选择题

In the sentence "... but also that they are arranged in a hierarchy... "(Para. 2) "they” refers to ______.

A．lower-order needs
B．higher-order needs
C．basic drives
D．many needs
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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
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
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