thousand和thousands of的用法有什么区别?

a thousand ,thousands of ,thousand of 和thousands and thousands of 的区别与用法 two thousand of 和thousands of 区别 thousand 、thousands、thousands of区别 our country has five ___________years of history A thousand B thousands C thousand of Dthousands o thousand和thousands of的用法有什么区别? two- thousand -word 和two- thousands -word 都对吗 thousands of和 ten thousand of哪个对? Ten thousand of people和ten thousands of the people a few thousand 和a few thousands of 哪一个对?many thousand 和many thousands of 哪个对? Several ____students came to the meeting答案和讲解A thousand B thousands C thousand of D thousands of thousand thousands thousand of thousands of 什么区别 thousand,thousands,thousand of,thousands of的区别 关于thousand、thousands、thousand of、thousands of应该怎么用? many thousand和many thousands of Eg:Many ____ trees should be planted on the mountains.A.thousand B.thousand of C.thousands D.thousands of 为什么答案要选A,而不是选D? 有没有many thousand,several thousand,和several thousands of2 Sharks have been on earthfor many _____ years.A thousand B thousands C thousands of D thousanded of选什么为什么 several thousand 和 several thousands of 的区别及具体用法还有这一题：There are_____students in my school A.several thousand B.several thousands of 要表示3000是three thousand还是three thousands?拜托各位大神意思就是要不要加s 这thousand和thousands有什么区别? 能举些例子么 初中英语的难点总结类似thousand 和 thousands 的区别之类的较为基础的