My  name  is Helen Green. My telephone number is 010—98635679. Look! This is my computer. It’s very nice. That is my pencil case. It’s blue and white. My pen is in it. What’s this ? Is it a ring? No, It’s a watch. It’s yellow. I like it very much.

小题1:My first name is         .

A. Helen       B.  Green         C. Mr Green

小题2:My telephone number is            .

A. 010—98636579      B. 010—89635679       C. 010--98635679

小题3:My computer is          .

A. bad         B. nice            C. so—so

小题4:My pen is         my pencil case.

A. on          B. at             C. in

小题5:I have a       watch.

A. green       B. blue            C. yellow

DN20的管螺纹的加工长度是（）螺纹牙数是9牙。

A、14mm

B、16mm

C、18mm

D、20mm