恶性肿瘤的主要生长方式为（）
A.内生性生长
B.浸润性生长
C.破坏性生长
D.内翻性生长
E.外生性生长
参考答案：B
用所给词的适当形式填空。
1. When I was reading, I _____ (hear)a noise in the garden.
2. When I _____ (arrive)in Shanghai, it was very hot.
3. This is an _____ (amaze) story. I like it.
4. I _____ (wait) for the bus this time yesterday.
5. Yesterday was Mother's Day, so I _____ (buy)a gift for my mother.
I became a student ten years . I have been a student 1996. I have studied here about 10 years.
A．ago, since, for
B．ago ,for ,since,
C．ago, before, for
D．ago, in, after
