侏儒症是由下列哪项因素引起的[ ]
A．幼年期缺乏甲状腺激素
B．幼年期缺乏生长激素
C．成年期缺乏甲状腺激素
D．成年期缺乏生长激素
答案：B
用所给动词的适当形式填空。
1. He is going to ______ (watch) TV this Sunday.
2. Why don't you ______ ( go) to movies?
3. We should ______ (study) hard.
4. It's a good idea ______ (read ) English in the morning.
5. How about ______ (play) football this afternoon?
6.—What aer they doing?
—They ______ (listen) ot music.
7. Can you ______ (help ) me with my English?
8. How often write the correct ______ (spell )next to the mistakes.
右冠状动脉的分支除外（）。
A.后室间支
B.左室后支
C.窦房结支
D.旋支
E.房室结支
