单项选择题

President Obama will arrive in Copenhagen ______ after it begins.
What can we learn about the research project announced by the United States Department of Agriculture

A．In the research project, ten farmers were given materials and trained how to build and use a hoop house.
B．The results showed that well-managed hoop houses can grow high-quality crops.
C．The research found that there are no weeds in a hoop house.
D．All of the above are right.
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单项选择题
In which aspects do WiLDNets be used in some places
A．WiLDNets is set connect to the Internet in Ghana and the Philippines.
B．In Guinea-Bissau, networks are being used to link community radio stations.
C．In northern India, a WiLDNet connects eye-care centers in poor village to an eye hospital in the city of Them.
D．All of the above are right.
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Why the shortage is most severe in developing countries
A．Many of their nurses leave to other countries.
B．They want to make more money.
C．They want better working conditions and better chances for career development.
D．All of the above are right.
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