引起原癌基因突变的DNA结构改变包括（）。
A.染色体畸形
B.基因缺失和基因扩增
C.染色体易位
D.插入诱变
E.点突变
参考答案：B, C, D, E
读一读，将序号标在括号内。
( ) We had rice,vegetables and fish.
( ) What did you drink?
( 1 ) What did you have for dinner yesterday?
( ) What are you going to have today?
( ) I drank some juice. My father drank some tea.
( ) We are going to have rice,meat and vegetables.
按照支队机关营房面积标准的规定，生活用房中的集体宿舍每人（）平方米。
A、6
B、8
C、10
D、4
