单项选择题

A．Scientists thought there wasn’t.
B．Scientists hadn’t got an answer.
C．Scientists were uncertain.
D．Scientists were still studying.
<上一题 目录 下一题>
热门 试题

单项选择题
A．He is likely to help.B．He is not willing to help.C．He doesn’t know a lot about computers.D．He also needs help.
A．He is likely to help.
B．He is not willing to help.
C．He doesn’t know a lot about computers.
D．He also needs help.
单项选择题
A．Because man has a strong desire for a modem way of life.B．Because pollution is caused by man.C．Because people from the countryside rush into the cities.D．Because people are not aware of the benefits of modem society.
A．Because man has a strong desire for a modem way of life.
B．Because pollution is caused by man.
C．Because people from the countryside rush into the cities.
D．Because people are not aware of the benefits of modem society.
相关试题