问题

One way for students to prevent H7N9 flu virus is to openthe windows of the classroom to allow the air to ________.

A:attract moreattention
B:see more injuries
C:record moresamples
D:accelerate

正确答案是：

同类题型

I looked through it to get a(n) _______impression of the article.

Much to my anger，my secretary has left me and his own company.

It is not_________book.

We ______ for one hour and a half and it is about time we ______ a rest.

It’ll be a year and a half ______ the next Olympic Games are held in London in 2012