On September 3, Tuesday, China surprised the world again. Another four ancient Chinese irrigation projects (中国古代灌溉工程) have been described as World Heritage Irrigation Structures (世界灌溉工程遗产). Now, China has 38 World Heritage Irrigation Structures on the WHIS list. 

1.China has _______ World Heritage Irrigation Structures before this September.

A 30

B 34

C 36

D 38

解析：选B。B 数字计算题。根据第一段中的“Another four ancient Chinese irrigation projects”“Now, China has 38 World Heritage Irrigation Structures”可知，9月3号，中国新增四处世界灌溉工程遗产，新增后为38处，由此可知，新增前，即9月前为34处。故选B。

2.Which irrigation project is in Shaanxi?

A The karez well system.

B The Gu’e system.

C The Fengyan terraced field system.

D The Jufeng weir system.

解析：选C。C 细节理解题。根据第二段中的“the Fengyan terraced field system in Hanyin, Shaanxi province”可知，陕西汉阴凤堰梯田是其中一处。故选C。

3.Do the irrigation projects work well?

A Yes, they do.

B No, they don’t.

C Yes, they are.

D No, they aren’t.

解析：选A。A 细节理解题。根据第三段中的“And they still work well.”可知，这些灌溉工程至今仍运行良好。故选A。

4.Irrigation projects can help ________.

A the doctors

B the singers

C the teachers

D the farmers

解析：选D。D 推理判断题。根据“irrigation projects”灌溉工程，及最后一段中的“They help the countryside, the nature and the water use a lot.”可知，灌溉有助于乡村发展，自然发展和改善用水，即最有利于农民。故选D。