阅读短文，选择正确答案。

      I am a teacher. I am 36 years old. My school is in a city. There is a river near the school. The water is

clean. In spring (春天), I can catch (抓) the fish and swim in it. There are some flowers and trees near the

river. In the trees, birds are singing. I like the fresh air and the blue sky.

      After dinner, I have a walk (散步) near the river.

      How happy I am!

1. Where is my school? [ ]

A. It's near the river.

B. It's in the river.

C. It's in front of the river.

2. The water is[ ]

A. fresh

B. clean

C. dirty

3. In the river, there are some[ ]

A. fish

B. trees

C. flowers

4. Near the river, there are[ ]

A. some flowers and trees

B. some fish and grass

C. some clouds and water

5. We have a walk near the river after [ ]

A. school

B. dinner

C. breakfast

下列对原核细胞型微生物结构的描述中，准确的一项是

A．有细胞壁但不含肽聚糖
B．细胞壁化学成分为肽聚糖和几丁质
C．含有线粒体、内质网、溶酶体等细胞器
D．革兰阴性菌细胞壁主要成分是磷壁酸
E．无核膜，核质为裸露环状DNA