用游标卡尺测一工件外径的读数如图所示，读数为___________mm。

Directions: In this section, you will hear ten short conversations. At the end of each conversation, a question will be asked about what was said. The conversation and question will be spoken only once. During the pause, you must read the four choices marked A, B, C, D, and decide which is the best answer. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center.

A．It means being convenient to be carried.

B．It means being readily to be divided.

C．It means being easily identified.

D．It means being carried in a big basket.