World Water Day is on March 22 every year. Which of the following is the symbol of it?

问题补充：

World Water Day is on March 22 every year. Which of the following is the symbol of it?

答案：

解析：句意：世界水日在每年的三月22号。下面哪一个是世界水日的标志？根据题意，故选C。