主要由一氧化碳和氮气组成的煤气是()煤气。
参考答案:高炉
–Peter has good grades in all his subjects, but he never shows off.
–I agree. He is very _________.
A.easy-going
B.imaginative
C.modest
D.generous
豨莶草具有的功效是()
A.化湿和胃
B.凉血消肿
C.活血止痛
D.清热解毒
E.清退虚热