It has won many ( ) titles such as a city of parks, a city of forests and an ecological civilization city in water systems.

(单选题)Why do animals stay awake at night? ( ) (单选题)What basic rules should you follow when handling the price? (单选题)What does “marketing mix” mean? ( ) (单选题)According to the passage, price can be defined as ( ). (单选题)Which of the following could best explain the meaning of bur (单选题)According to the passage, which of the following situation c (单选题)The primary purpose of the passage is to ( ). (单选题)What’s the most suitable title for the article? ( ) (单选题)What’s the tone of the author? ( ) (单选题)What cannot be inferred from the article? ( )