根据短文理解完成下列各题。

C

    Shenzhen is a city in South China. It is not very big, but it has attracted people of the whole country and the whole world as well.

    Just about twenty years ago, it was only a small fishing village. There were not many people there. Most of them lived on fishing. Things have greatly changed since the 1980's. It became the first special economic zone (经济特区) in China.

    Because of the opening policy(政策), economic changes between China and the outside world have increased greatly. People can come and go easily between Shenzhen and Hong Kong. Both foreigners and Chinese have built a lot of factories, companies and tourists' attractions there. People all over the country have come to find jobs. Many of them have settled down in this new booming(兴起的) city.

    Shenzhen is developing so fast that it has become a well-known metropolis(大都市) in China.

下列人类活动不会对生物圈造成破坏的是（　　）

①排放污水  ②植树造林   ③养花种草    ④围湖造田   ⑤喷洒农药 ⑥大量砍伐森林．

根据语言环境，用口语方式转述下面书面材料的内容。

材料：①徐凡，男，江苏南京人，东方大学文学院教授。②系我国红学界后起之秀，③尤以考证作者身世见长。④专著《曹雪芹家世考》、《大观园人物论》、《<红楼梦>导读》(获优秀教育图书奖)在海内外享有盛誉。

要求：①内容适当。②表达得体。③符合口语特点。④将转述的话写在相应的横线上。

学校邀请徐凡与学生座谈时，你以文学社成员的身份向同学们介绍说：

已知在酸性溶液中，下列物质氧化KI时，自身发生如下变化：Fe³⁺→Fe²⁺；MnO₄^﹣→Mn²⁺；Cl₂→2Cl^﹣；HNO₃→NO．如果分别用等物质的量的这些物质氧化足量的KI，得到I₂最少的是（　　）