单选题 Which of the following was NOT mentioned as to what people around the world did to celebrate Earth Day on April 22, 1990?

A、 Travelers cleared up rubbish on mountains.
B、 Children planted trees.
C、 Government officials made speeches in public to encourage people to do something for the earth.
D、 Artists and musicians gave shows to support the environmental group's work.

【正确答案】 C

【答案解析】本题为细节辨认题。由第三段“In Nepal，hikers picked up trash on Mount Everest"可以得出A项正确；由谊段“In the United States，children planted trees"可以得出B项正确;由本段“artists drew pictures on walls next to highways，and musicians gave concerts to support the work of environmental groups"可以得出D项正确。因此，该题可用排除法选C。