单项选择题
Which of the following correctly describes Cosmos I
A.It is a 3-ft. metal pod.
B.It has eight 35-ft. metallic wings.
C.It can fly an altitude above 260 miles.
D.When it flies back to Earth, it will fall into pieces.
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单项选择题
What is the energy source of this so-called solar-sail vehicle
A.Sunlight.
B.Nuclear.
C.Wind.
D.Electricity.
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单项选择题
What does brainchild in Paragrapth 4 mean
A.Patent.
B.Invention.
C.Hope.
D.Prid
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