单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．She likes riding horses.
B．She has been promoted once a year.
C．She won the second place in a contest.
D．She is very excited.
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单项选择题
Which of the following can be best answered by the information about the reduction of losses and waste in engineering
A．When do losses and waste soar in a machine
B．Why is the work of the chemical engineer important to oil refining
C．How does the engineer achieve the good design of a product
D．What are essential for the efficient functioning of a machine
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