单项选择题

What is the main topic of the conversation

A．The development of the automobile.
B．Declining air quality.
C．The structure of nitrous oxides.
D．Air quality management.
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单项选择题
Have you ever received_________of what has happened to her
A．the word
B．words
C．word
D．the words
单项选择题
Which of the following is NOT discussed as an ability animals are thought to have
A．Selecting among choices.
B．Anticipating events to come.
C．Remembering past experiences.
D．Communicating emotions.
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