主动脉弓的分支有（）
A.右颈总动脉
B.左颈总动脉
C.冠状动脉
D.肺动脉干
E.右锁骨下动脉
参考答案：B
用动词的适当形式填空。
1. My brother ______________ (be) a policeman.
2. Sarah ______________ (go) to school on foot every day.
3. Can you ______________ (see) the birds in the sky?
4. How ______________ (do) your sister go to work?
5. Alice and Ann ______________ (be) twins.
6. Miss White ______________ (like) collecting stamps.
汉字的排列顺序有（）、（）、（）三大类。
