连接南北美大陆的天然桥梁是[ ]
A、巴拿马运河
B、西印度群岛
C、中美地峡
D、墨西哥高原
答案:C
The question is very important. It really needs _______.
A.carefully discussing
B.carefully to discuss
C.to carefully be discussed
D.being discussed carefully
工程咨询公开招标程序采用公开招标方式的招标文件包含的内容有( )。
A.招标人须知
B.招标人年龄
C.招标公告
D.委托服务范围
E.拟签订的合同条款