参与尿素循环的氨基酸是（）
A.蛋氨酸
B.鸟氨酸
C.苯丙氨酸
D.色氨酸
E.丙氨酸
参考答案：B
选词填空。
1. It's Chinese New __________ (Year's Years') Day.
2. Everyone __________ (put, puts) on new clothes.
3. I like new red clothes __________ (for, of) New Year's Day.
4. In the evening, our family __________ (has, having) supper together.
5. Pork __________ (is, are) meat from pigs.
须弥座又称______座，常用于宫殿和著名寺院的主要殿堂建筑。
