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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单项选择题
What is the speed of the outpost
A．15 miles per second.
B．5 miles per second.
C．206 miles per second.
D．5 miles per minut
单项选择题
What features shaped America according to this passage
A．Materialism and practicalism.
B．Individualism and heroism.
C．Collectivism and Buddhism.
D．Pluralism and the very free spirit.
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