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Science: When is Earth Day? When is World No Tobacco Day? What month is bird-loving week in a year? Mathematics: 4× 7-() 4 = 20?
Earth Day is April 22nd every year; World No Tobacco Day is May 3 1 day every year; A week from the end of April to the beginning of May every year is "Bird Love Week". 4×7-(32)÷4=20

1, Earth Day, that is, April 22nd every year, is a worldwide environmental protection activity. In 2009, the 63rd UN General Assembly decided to designate April 22nd as "Earth Day" every year.

The purpose of this activity is to arouse people's awareness of caring for the earth and protecting their homes, promote the coordinated development of resource development and environmental protection, and thus improve the overall environment of the earth.

2. World No Tobacco Day was founded by the World Health Organization in 1987, and now May 3 1 is the World No Tobacco Day every year. The first World No Tobacco Day is April 7th 1988.

Since 1989, World No Tobacco Day has been changed to May 3 1 day every year. The significance of World No Tobacco Day is to promote the concept of smoke-free. Every year, there is a central theme, which points out a topic worthy of special attention in tobacco and smoking ban in that year.

3. Caring for birds is conducive to maintaining ecological balance. "Bird Love Week" originated from 198 1, and was originally established to protect migratory birds migrating between China and Japan. 1992 The Regulations on the Protection of Terrestrial Wildlife approved by the State Council confirmed "Bird-loving Week" in the form of laws and regulations.

A week from the end of April to the beginning of May every year is "Bird Love Week", during which various publicity and education activities are carried out. Hold a radio conference on bird-loving week, hold an academic report meeting on bird-loving week, hang artificial nests, and distribute and post posters on bird-loving week. Due to the vast territory of our country and the different climate between the north and the south, the time of bird-loving week varies from place to place.