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(单选题)( ) customers have an idea of the stores before shopping. (单选题)"Courteous" is opposite to ( ) . (单选题)"You clear your throat" in paragraph 2 means ( ). (单选题)What can we infer according to the text? ( ) (单选题)What can parents do according to the researchers? ( ) (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