A：
B：
C：
用基因型为rr的枝条作接穗，成功嫁接到基因为RR的砧木上，在正常情况下，该枝条上结出了果实，判断果皮的基因型正确的是（ ）
下列说法中，正确的是（ ）
Actor wanted by Movie Company
Can you sing and dance? Can you work with other people?
Can you work evenings and weekends?
If you want to be an actor, please call the Movie Company at 9935673.
Wanted
Do you like to talk with different people? Do you like a busy but interesting job? Do you like to join the TV station?
Work time: 8: 30a.m.—5: 50p.m., 5 days a week.
Tel: 2433571, 2433572, 2433573
Add: No. 24, Rose Building, Wilton Street
We need Teachers
Do you love children? Are you friendly to children?
Do you like to teach children English, math, history or biology?
Call the Green Children's School at 5113470 or send your e-mail to Children@yahoo.com
在七个分类等级中，包括的生物种类最多和生物共同特征最多的分别是（ ）
