单项选择题

Which of the following was NOT mentioned as to what people around the world did to celebrate Earth Day on April 22, 1990

A．Travelers cleared up rubbish on mountains.
B．Children planted trees.
C．Government officials made speeches in public to encourage people to do something for the earth.
D．Artists and musicians gave shows to support the environmental group's work.
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单项选择题
Some students are enthusiastic for positions in Student organizations probably because ______.
A．they hate the constant pressure and strain of their study
B．they will, then be able to stay longer in the university
C．such positions help them get better jobs
D．such positions are usually well paid
单项选择题
The last paragraph implies that ______ the importance of protecting the earth.
A．only on Earth Day do people realize
B．people in the world have begun to realize
C．people in the world are well aware of
D．Europeans are not aware of
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