根据要求改写句子。

1. There is a football match between Class One and Class Two. (用tomorrow改写句子)

There _______ _______ _______ _______ a football match between Class One and Class Two

tomorrow.

2. He does his homework every morning .(改为否定句)

   He_______ _______ his homework every morning .

3. I’m going to take a plane to Beijing.(改同义句)

   I’m going to go to Beijing _______ _______ .

4. My brother and I read in class every day.(把every day改为now)

My brother and I_______ _______ in class now.

5. The homework usually takes me 2 hours.(对划线部分提问)

   _______ _______ does the homework usually _______ you ?

体外姐妹染色单体交换试验检测的主要遗传学终点是（）

A.DNA完整性改变

B.DNA重排或交换

C.DNA碱基序列改变

D.染色体完整性改变

E.染色体分离改变