按要求改写下列句子，每空一词。

1. We clean the classroom every day.(用tomorrow代替every day)

    We            the classroom tomorrow.

2. Will your mother come back soon?(作肯定回答)

               ,                      .

3. They'll go shopping with us.(改为否定句)  

    They                      shopping with us.

4. The farmers will work on the hill.(画线部分提问)

                      the farmers           ?

5. The students will go back to school in two days.(对画线部分提问)

       _                       the students           back to school?

6. Tommy has five pens and I have two pens.(改为同义句)

    I have three pens                        Tommy.

男，40岁，某蓄电池厂制造工，工龄 20年，主诉阵发性腹部疼痛4小时。患者在发病前常有食欲不振、腹部隐痛、便秘等症状。检查腹软，脐周有压痛，无反跳痛，血象检查白细胞数正常。

为防止其他工人发生类似情况，应采取的根本性预防措施是

A．生产过程密闭化、自动化

B．加强卫生监督

C．安置局部排毒装置

D．加强个人防护

E．定期体格检查