单项选择题

Aphelion is the point where the Sun（）.

A.and Moon and Earth form a right angle
B.and Moon and Earth are in line
C.crosses the celestial equator
D.is farthest from the Earth

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单项选择题

A.meet the applicable standards
B.be marked as additional equipment
C.be stowed in a separate area
D.All of the above

单项选择题

A.Cooling ability
B.Leaves no residue
C.Penetrating power
D.Nonconductivity

单项选择题

A.Scorpio
B.Corvus
C.Libra
D.Corona Borealis