中国大学MOOC: Cautionary public signs warn the public of important issues or dangers.
举一反三
- 中国大学MOOC: The government has a policy of ____________ the public awareness of the dangers in smoking.
- 中国大学MOOC: Informatory public signs offer information of locations or provide services, etc., to the public.
- 中国大学MOOC: Valentines Day is an important public holiday in many countries.
- 中国大学MOOC: He came to warn him of the ________(danger; dangers) ahead.
- 中国大学MOOC: Five important factors in a public speaking involve______________ , ______________,______________ ______________, and effect. （多选）