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To pollute a river requires only one flush of waste water from homes or factories, but the recovery process can take dozens of years.

Mr Chen grew up near Donghu Lake, a waste water basin in the Changle District of Fuzhou. He said, “The water in the lake was very clear with fish living in it when I was a little kid. The water could even be used for drinking. But in the following years, the water quality gradually went bad because of cattle waste, village garbage and illegal discharging in the lake. The clear water turned dark and smelly. Water plants on the lake once covered more than half the surface and eventually the water couldn’t be used for farmland watering anymore."

Since 2013, the local government has given 420 million yuan ($60.6 million) to repair the lake. “We shut down 250 cattle farms surrounding the basin, laid 13.3 kilometers of wastewater-collecting pipes connecting 120 factories and dug 5.33 km of waterways,” said Wang Jianbo, press spokesman at the Fuzhou Environmental Protection Department. “We dug streams to the lake, built slopes at the banks and built greenbelts in the upper reaches of the basin. There is also a pump station close to the lake used for pumping waste water to a nearby waste dealing factory.”

“Finally, Donghu Lake has returned to what it looked like 30 years ago,” Chen said. After two years, the recovery project was completed and the water quality has improved. Many kinds of plants grow along the water’s edge. As a result of the improvement, Donghu Lake hosted a national kayaking(皮划艇) competition in October 2015.

1.To recover the water quality in the lake takes _______.

A several months

B a short time

C a long time

D a few days

解析：选C。细节理解题。根据第一段…but the recovery process can take dozens of years.可知要恢复水质需要几十年的时间，是一个很长的时间段，故选C。

2.The water in the Donghu Lake was once ______.

A polluted

B quite clear

C smelly

D bad

解析：选B。推理判断题。根据第二段第二句The water in the lake was very clear with fish living in it when I was a little kid. The water could even be used for drinking.可知东湖的水曾经是非常干净清凉的，故选B。

3.What made the water quality go bad?

A Cattle waste.

B Village rubbish.

C Illegal discharging.

D All of the above.

解析：选D。细节理解题。根据第二段第三句But in the following years, the water quality gradually went bad because of cattle waste, village garbage and illegal discharging in the lake.可知东湖的水质变差是由于牲畜蓄养排放、村庄产生的垃圾和非法排放三个原因造成的，故选D。

4.Which of the following statements is NOT true?

A There were too many water plants that made the water smelly.

B The local government spent lots of money recovering the lake.

C Waste water collecting pipes were built to collect polluted water.

D After recovery, the water quality in Donghu Lake has improved a lot.

解析：选A。综合理解题。根据第三段最后一句Water plants on the lake once covered more than half the surface and eventually the water couldn’t be used for farmland watering anymore.可知东湖之上曾经长满水草导致要取水灌溉都困难，这里是想说东湖水质好，而不是水草导致水质变差，故A选项错误，故选A。

5.What’s the main idea of this passage?

A Environment protection in Fuzhou.

B How to make water clear.

C The cause of Donghu’s pollution.

D The recovery of Donghu Lake.

解析：选D。主旨大意题。东湖的水曾经清澈，后被污染，然后采取措施治理并取得成果，故本文主旨大意是说东湖水污染治理有效，故选D。