单项选择题

A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
<上一题 目录 下一题>
热门 试题

填空题
struck
单项选择题
According to the text, interest in robots has increased in recent years because of ______.
A．RoboCup
B．Sony’’s Aibo dog
C．a rise in public awareness
D．technological advances
相关试题