C.It was launched in the sixties of the twentieth century.
D.It has been used for more than 40 years.
3.a world that is still full of mysteriesrefers to
A.The earth.
B.Out space.
C.The ocean.
D.Mars.
4.In what aspects are the new HOV and Alvin similar?
A.Size.
B.Speed.
C.Capacity.
D.Shape.
5.In what aspects are the new HOV and Alvin different?
A.Offering better views.
B.Speed.
C.Size.
D.Both A and B.
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