单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．International children’s projects.
B．Social and environmental projects.
C．Projects for people with no money.
D．Projects involving sports and languages.
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单项选择题
A．The workers on the underground platforms were replaced by machines.B．It became the first completely automatic railway in the world.C．A completely automatic line was added to its network.D．Its trains became computer-controlled.
A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Its trains became computer-controlled.
单项选择题
According to Ed Diener, which of the following can be measured by the index of happiness
A．The standard of morality.
B．The freedom of speech.
C．The sense of well-being.
D．The access to health care.
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