单项选择题

A．The effect of the atmosphere on rainfall.
B．How water originated on earth.
C．How conditions on earth support life.
D．A new estimate of the age of earth.
<上一题 目录 下一题>
热门 试题

单项选择题
A．Studying.B．Playing cards.C．Preparing snacks.D．Learning how to play bridge.
A．Studying.
B．Playing cards.
C．Preparing snacks.
D．Learning how to play bridge.
填空题
Many universities in U.S.A. offer courses of ice cream science.
相关试题