求救几道初中英语语法题

求救几道初中英语语法题
1.( ) of people in the world are sending information by E-mail ever day.
A.Many million B.Several million C.Several millions
D.Many millions
答案上说是C.但我觉得D好像也对.
2.---How long will you stay here?
---For ( ).
A.one and two day's B.one and two day
C.a day or two D.one or two day
答案上说选C.为什么?
2.There are ( ) doctors and nurses working hard in that hospital.
A.thousand B.two thousand C.two thousands D.two thousands of
答案上说选D.为甚?
3.---What's one fourth and a half ,do you know?
-----Yes,it's ( )
A.two sixths B.three fourths C.one three
答案上说选A.为什么?
4.Several ( ) new books were sold out last week.
A.of thousand B.thousands C.thousand of D.thousand
答案上说选D.为什么?
5.It is reported that ( ) people in the world are suffering from the H1N1 flu.
A.several thousands of B.ten thousands
C.thousands of C.thousands
答案上说选C.但我觉得A也可以.