NO是由（）合成的。
A.赖氨酸
B.瓜氨酸
C.精氨酸
D.组氨酸
参考答案：C
That is a beautiful kingdom _________ three mountains join together and steep mountains reached to the sky.
A．which
B．whose
C．that
D．where
You must retell the text with _____.[ ]
A. own your words
B. words your own
C. your own words
D. your words
