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(单选题)What is the passage mainly about? ( ) (单选题)What can we learn from the passage? ( ) (单选题)How much sleep do the average teens need? ( ) (单选题)How many parents report their teens worry about school? ( (单选题)This new policy proved effective, leading to ( ) increase (单选题)Poor schooling was the ( ) of the unemployment problem. (单选题)One's economic condition often ( ) his or her way of life (单选题)These are defensive behavior patterns which ( ) from our (单选题)If you want to keep healthy, you should ( ) the foods you (单选题)This table is strong and ( ).