Hi! I’m Tina. This is a photo of Class 2. This class has twenty-five students, twelve girls and thirteen boys. These are Amy and Bob. Amy is Bob’s sister. Amy is 12 and Bob is 13. Amy likes math and English. Bob likes music (音乐). He has a CD collection. This is Bruce. He is 14. He likes sports and has a sports collection. Jerry is a teacher (教师). He is twenty-four. He likes blue, black and green. Many of his clothes are in these colors. Do you know the relationship between Jerry and Bruce? Aha! Jerry is Bruce’s uncle.

根据短文内容,选择正确答案。

小题1:______ girls are in Class 2.

A．12

B．13

C．24

D．25小题2: What does Bob like?

A．Math.

B．Music.

C．English.

D．Sports.小题3:What color does Jerry NOT like?

A．Blue.

B．Yellow.

C．Black.

D．Green.小题4:What’s the Chinese meaning of (……的汉语意思) relationship?

A．性别

B．国籍

C．关系

D．爱好小题5:______ and Bruce are in a family.

A．Bob

B．Jerry

C．Amy

D．Tina

已知某产品的第一种生产方案单件工艺成本为：

试计算在何种情况下，采用第一种工艺方案比较划算？