慢性腹痛的常见病因正确的是（）A.溃疡病 B.慢性肝炎 C.恶性肿瘤 D.卵巢扭转

阅读理解.

     My school life My home is far (远的) from our school. So I live in school from Monday to Friday.

In school, there are many friends. We can play and study together. It's fun. This term, school begins

at 8:00. We have more time to sleep. Everyone is happy. I usually eat bread for breakfast at half past

seven. After lunch and supper, I usually go for walks with my classmates for about fifteen minutes

(分钟). We have twelve subjects in school. I like English best! Our English teacher teaches us a lot.

And she is lovely and fairly. We all like her. We have much fun in English classes. In school, I hate

washing clothes. It's tired and boring. We don't have too much homework in school. Sometimes, I go

to the library to read books. It's good for me. Now I am in grade 2, I must work hard. I think I can

be a good student. What about you? Let's study hard together!

根据短文完成下边的对话. A-reporter  B-me

A : Do you go to school every day?

B : No. I live ___1___ our school. So I live in school on weekdays.

A : Do you like to live in school?

B : Yes. Because I can ___2___ with my friends .

A : When do you begin school?

B : ___3___.

A : Well, you can have more time to sleep.

B : Yes, and Everyone is happy.

A : What do you usually do after lunch?

B : I usually walk with my friends for about ___4___.

A : It ' s good for your health (健康). Can you tell me what your favorite subject is?

B : ___5___.

A : Thank you!

旅游经营者应当遵守的原则是（）。

A.公平

B.公正

C.诚实

D.信用

企业民主管理制度的基本形式包括（）。

A．合理化建议

B．职工大会

C．平等协商制度

D．质量小组

E．职工代表大会制度

当土壤水势大于根细胞水势时，植物根细胞（）？

A、失水

B、吸水

C、不变

D、死亡

加氢催化剂预硫化过程中，当循环氢中硫化氢浓度大于（）%（v）时，应适当减少硫化剂注入量。

A、0.5

B、0.8

C、1.0

D、2.0