单项选择题

Questions 14 to 16 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
What is a hopper

A．It is a clerk.
B．It is a bill.
C．It is a box.
D．It is a vot

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单项选择题

单项选择题

Questions 14 to 16 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What is a hopper 您的浏览器不支持 audio 元素。