单项选择题

A．Because it changes color in a regular 24-hour rhythm.
B．Because it changes color in response to the sun’s rays.
C．Because it constantly changes color.
D．Because it changes color every hour.
<上一题 目录 下一题>
热门 试题

单项选择题
A．The stem of the nettle.B．Small stinging hairs on the nettle’s stem.C．The sap of the nettle.D．The slender nettle.
A．The stem of the nettle.
B．Small stinging hairs on the nettle’s stem.
C．The sap of the nettle.
D．The slender nettle.
单项选择题
A．They are the parents of young children.B．They are professional storytellers.C．The stories will help them improve their vocabulary.D．The stories are required for a course.
A．They are the parents of young children.
B．They are professional storytellers.
C．The stories will help them improve their vocabulary.
D．The stories are required for a course.
相关试题