单项选择题

It can be inferred from the text that_____.

A．the main aim of the spacewalk was not accomplished
B．the final repairing work depends on future
C．the spacewalk cost much
D．repairing work has finished

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单项选择题

What is crucial to the future work on the construction site in space

A．The arms.
B．The robot.
C．The robotic arm-to the station.
D．The shuttle.

单项选择题

The sentence in the ninth paragraph, researchers are not likely to have anything resembling a blood test for a mental illness soon means that_____.

A．mental illness can not be diagnosed by blood test.
B．there is not a definite criterion for mental illness.
C．researchers do not like to use blood test.
D．techniques have gained enough progress but are still not enough for mental illness.