题目内容

Short conversation 2[音频]

A. He is worried about the wastewater recycling.
B. He is worried about the price of the tiny engines.
C. He is worried about people in areas lacking water.
D. He is worried about the pollutants in wastewater.

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Short conversation 3[音频]

A. The man is tired of driving cars to work every day.
B. The man is planning to buy an intelligent car.
C. The man thinks intelligent cars might be expensive.
D. The man is working with some engineers on intelligent cars.

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Short conversation 4[音频]

A business idea brought forth by an airline.
B. How to share online profiles to look for a potential relationship.
C. A dating progam which helps people look for a partner online.
D. The in-flight online service offered by an airline.

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Short conversation 5[音频]

A. She suggests the man shoot video for people online.
B. She suggests the man quit the online business.
C. She suggests the man start a video store online.
D. She suggests the man edit videos for people online.

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正弦波自激振荡器振荡建立过程，晶体管的工作状态是（）

A. 甲类
B. 甲乙类
C. 丙类
D. 甲类－>甲乙类－>丙类

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Short conversation 2[音频]

A. He is worried about the wastewater recycling. B. He is worried about the price of the tiny engines. C. He is worried about people in areas lacking water. D. He is worried about the pollutants in wastewater.

Short conversation 3[音频]

Short conversation 4[音频]

Short conversation 5[音频]

正弦波自激振荡器振荡建立过程，晶体管的工作状态是（）

A. He is worried about the wastewater recycling.
B. He is worried about the price of the tiny engines.
C. He is worried about people in areas lacking water.
D. He is worried about the pollutants in wastewater.