下列物质在氧气中燃烧时，能看到浓厚白烟的是[ ]
A.氢气
B.硫粉
C.红磷
D.木炭
答案：C
开标工作由()主持。
A.招投标管理机构
B.评标委员会
C.招标人
D.业主
8. – Who will be sent to meet the headmaster?
- I’ve_________a car to pick him up at the airport.
A．arranged for
B．arranged
C．arranged with
D．arranged of
