单项选择题

A work contract is signed when______.

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单项选择题

The example in Paragraph 3 is meant to emphasize that（）

A．both short-term happiness and long-term happiness are important
B．we tend to seek short-term happiness instead of long-term happiness
C．people prefer long-term happiness to short-term happiness
D．short-term happiness may contradict long-term happiness

单项选择题

The difference between table salt and sea slat lies in that table salt（）

A．contains less natural minerals than sea salt
B．forms clumps more easily than sea salt
C．tastes better than sea salt
D．goes through less processing than sea salt