与燃气灶具相连的旋塞阀，进气接口与室内送气管相连，通常采用（）连接。

A、法兰

B、焊接

C、热熔对接

D、螺纹

How was your trip to London, Jane?（）

A.Oh, wonderful indeed.

B.I went there alone.

C.The guide showed me the way.

D.By plane and by bus.