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(单选题)The author intends to ( ). (单选题)The Relaxacisor is mentioned as ( ). (单选题)FDA can ask for the proof of safety and effectiveness of a p (单选题)Which of the following is true according to the text? ( ) (单选题)It can be inferred that ads mentioned in the text are ( ) (单选题)What was the author’s purpose when writing this passage? ( (单选题)A good gardener prunes a tree ( ). (单选题)Why is a special material painted on the tree? ( ) (单选题)Trees become unhealthy if the gardener ( ). (单选题)Why should pruning be done? ( )