赞题库-背景图
单项选择题

A．1 hour.
B．30 minutes.
C．1.5 minutes.
D．2 hour.
<上一题 目录 下一题>
热门试题

单项选择题A．Because the Earth is heavily polluted.B．Because nature cannot recycle its resources.C．Because there are more and more people living on the Earth.D．Because no more new resources can be added.

A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.

单项选择题A．1727.B．1826.C．1839.D．1860.

A．1727.
B．1826.
C．1839.
D．1860.