关于凸透镜对光线的作用，下列说发中正确的是 [      ]

A．光通过凸透镜就会变成平行光  

B．只有平行于主轴的光线通过凸透镜才能被会聚

C．发散的入射光线透过凸透镜不会会聚  

D．所有光线通过凸透镜都会被会聚．

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Communicating via e-mail is by far the most common Intemet activity. You can （）with anyone in the world who has an Intemet address or e-mail （）with a system connection to the Internet. All you need is （）the Internet and an e-mail program. Two of the most widely used e-mail programs are Microsoft’s （） and Netscape’s Navigator. A typical e-mail message has three basic （）: header, message, and signature.

All you need is （）the Internet and an e-mail program.

A．attach with

B．grasp

C．possess

D．access to