克隆技术具有多种用途，但是不能[ ]
A．有选择地繁殖某一性别的个体
B．繁殖家畜中的优良个体
C．用于保存物种
D．改变动物的基因组成
答案：D
用所词的适当形式填空。
1. A large number of _______ (foreign) visit Guizhou province these years.
2. Thank goodness! The letter I was looking forward to _______ (reach) me at last.
3. Hainan Island is a _______ (wonder) place to spend summer.
4. The dinner room must _______(clean) three times a day.
5. My cousin is used to _______ (study) with his new friends in Australia.
变速器漏油的原因之一是（）。
