My sister is _____________ Class One. [ ]
A. at
B. in
C. on
答案：B
(2013·北京高考)________ the course very difficult, she decided to move to a lower level.
A．Find
B．Finding
C．To find
D．Found
依据《合同法》的规定，下列属于要约邀请的有( )。
A．寄送的价目表
B．拍卖公告
C．招标公告
D．招股说明书
