大型养路机械两车联挂后必须（）才能连接风管，并打开折角塞门。
参考答案：试拉
—Did Mr. Brown make a suggestion in the meeting?
—He _________ a good plan to make the farmers __________.
A．put forward; benefit from
B．looked forward; benefit from
C．kept up with; benefit
D．put up with; benefit
在因特网域名体系中，商业组织的顶级域名是______。
A．edu
B．org
C．com
D．net
