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1.what were some of the negative effects on the Li River as a result of the growth in tourism.
Many tourists threw garbage into the river. Kitchens on board were using oil which was thrown into the river. The growth of tourism meant the local population rose rapidly, as well as the commercial and industrial enterprises. More household and commercial waste ended up in the water. More chemicals led to severe water quality issues.
2.What measures have been taken to improve the LI River water quality?
The construction of waste water treatment facilities
The collection and transport of household waste
Dozens of pollution enterprises were closed or moved.
New rules were made.
The local government uses the media to spread the awareness of protection.
Carry out inspections regularly.
3.What is the “river chief system”?
It means holding senior officials responsible for reducing water pollution.
教材原句p.26 This alarming case showed how the increase in temperature had an impact on Earth’s ecology. 这一令人震惊的案例表明，气温升高对地球生态产生了怎样的影响。
2. have an impact on 对……有影响；对……造成影响
There is no proof that French had an impact on the Chinese language.
没有证据表明法语对汉语有影响。
【词语积累】
have an effect/influence on... 对……有影响
教材原句p.26 The ““natural” greenhouse effect refers to the fact that heat from the sun enters the atmosphere... “自然”温室效应指的是来自太阳的热量进入大气层……
3. refer to（to 是介词）
（1）指的是
People who are likely to succeed refer to those who are ambitious.
可能成功的人是指那些有抱负的人。
（2）提到，谈到
搭配：refer to...as... 把……称为……
She referred to a strange solid in her report. 她在报告中提到了一种奇怪的固体。
The child referred to the colorful ribbon as rainbow. 那个孩子把彩带称为彩虹。
（3）参考，查阅
You can refer to the excellent mechanic’s notes if you want.
如果你想的话，你可以参考优秀技工的笔记。
Please refer to a dictionary to check the spelling. 请查一下词典看看拼写是否正确。
