单项选择题

Why is light coloring an advantage to large desert animals

A．It helps protect them from other dangerous animals.
B．It keeps them cool during the day.
C．It keeps them warm by reflecting light.
D．It helps them maintain a constant body temperature.

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单项选择题

A．In 15th century.B．In the 17th, century.C．Before 15th century.D．After 17th century.

A．In 15^th century.
B．In the 17^th, century.
C．Before 15^th century.
D．After 17^th century.

单项选择题

A) easily C) willinglyB) reluctantly D) normally

A．easily
B．reluctantly
C．willingly
D．normally