单项选择题

The main idea of the passage is________.

A．Saudi Arabia had undergone a big change
B．the per capita oil income of Saudi Arabia has fallen
C．Saudi Arabia is reforming its schools
D．the Saudi economy can not afford a job to every Saudi now

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单项选择题

What is the best title for the passage

A．Virgin Materials and Secondary Materials
B．What is Recycling
C．Solid Waste Management
D．Problems of Recycling