下列气体那种是助燃气体()。
A.氢气
B.氧气
C.氮气
参考答案:B
—The concert was wonderful!
—Really? How I wish I ______to the theatre with you yesterday!
A.had gone
B.might go
C.were able to go
D.would go
下列不含消化酶的消化液是[ ]
A.胆汁
B.肠液
C.唾液
D.胰液