前段时期，某省空气污染严重，并出现雾霾天气，其中PM2.5（大气_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题多项选择题

前段时期，某省空气污染严重，并出现雾霾天气，其中PM2.5（大气中直径小于或等于2.5微米的细颗粒物）富含大量的有毒、有害物质，严重影响人们健康。下列有关叙述不正确的是（）

A.节能减排是有效缓解这一环境危机的主要途径

B.PM2.5超标的空气使过敏病人发病时，B淋巴细胞的细胞周期延长

C.PM2.5中的一些酸性物质进入人体血液会导致其pH明显下降

D.PM2.5含量过高主要是人类活动的影响超过了生态系统的自我调节能力

答案

参考答案：B, C

阅读理解

阅读理解。

We are middle school students. We're in Class 3, Grade7. This is our classroom. It is a nice big room. You can see

a clock over the blackboard. You can see desks and chairs in the room. They're new. The books are on the desks.

The bags are behind the chairs. Can you see a big desk? It is the teacher's desk. On the teacher's desk you can see

some flowers. They are for our teacher, Miss Gao. She is a good teacher.

根据短文内容，判断句子的正(T)，误(F )。

( )1. A clock is under the blackboard.

( )2. The books are on the desks and the bags are behind the chairs.

( )3. We are students. We're in Class 1, Grade 7.

( )4. The teacher's desk is big.

( )5. Miss Gao is a good teacher.

单项选择题

在下列各级标准的引用中，属于正确的引用的是（）。

A.地方标准引用地方标准；

B.企业标准引用企业标准；

C.国家标准引用行业标准；

D.行业标准引用地方标准。