单项选择题

A．The high temperatures required for its use.
B．The high cost of materials used in its production.
C．The lack of trained environmental engineers.
D．The opposition of automobile manufacturers.
<上一题 目录 下一题>
热门 试题

单项选择题
A．He hasn’’t talked to his brother since he transferred.B．He doesn’’t think his brother should transfer.C．His brother doesn’’t want to transfer.D．He hadn’’t heard the news about his brother.
A．He hasn’’t talked to his brother since he transferred.
B．He doesn’’t think his brother should transfer.
C．His brother doesn’’t want to transfer.
D．He hadn’’t heard the news about his brother.
单项选择题
A．They have difficulty identifying these cells.B．They aren’’t sure how these cells work.C．They’’ve learned how to reproduce these cells.D．They’’ve found similar cells in other species.
A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
相关试题