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单项选择题

In this section, you will hear three passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Impulse Buying.
B、Self-Service Shopping.
C、The More Products, the More Confusion.
D、Psychologists and Merchandising Experts.

问答题

什么是花卉无土栽培营养液？