脊柱胸段呈弧形后凸，脊柱强直性固定，仰卧位时亦不能伸直的疾病是（）。

A.脊柱结核

B.强直性脊柱炎

C.脊柱压缩性骨折

D.佝偻病

E.脊柱骨软骨炎

根据要求转换下列句型,每空一词。

1.He often goes home on foot. (同义句转换)

He often                       .

2.My sister does housework at the weekend.(否定句)

My sister                    housework at the weekend.

3.The girl in red is Tom' sister.(划线部分提问)

             girl is Tom's sister?

4.Does Jim help his mother do the housework?(改为陈述句)

Jim          his mother do the housework.

5.There is a knife at home.(对划线部分提问)

How many                      there at home?

6.They are old computers.(改为单数句)

                      old computer.