单项选择题

What is the news mainly about

A．The investment of Yahoo in Alibaba.
B．The sales report of Yahoo.
C．The e-commerce in China.
D．The investment of Alibaba in Yahoo.
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单项选择题
Which of the following is true of the American-made devices
A．They are washing machines.
B．They are used to steer and steady the International Space Station.
C．They have been plagued with problems for more than three years.
D．They will be replaced by the Russian-made devices.
单项选择题
What was the most important job for the astronauts of Discovery
A．Spacewalking.
B．Replacing the broken flywheel.
C．Entering the International Space Station.
D．Contacting the ground controllers.
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