单项选择题

What does the author imply about desert-adapted mammals

A．They don't need to eat much food.
B．They never lose their appetite.
C．They can travel long distances looking for food.
D．They can eat large quantities quickly.

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Outline:1. 竞争是当今社会的普遍现象;2. 竞争的好处;3. 竞争是同时不要忘记合作。On Competition

单项选择题

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

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