In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

What is the purpose of this talk

A. To encourage people to participate in a club activity.
B. To introduce a new kind of bicycle.
C. To inform beginning cyclists about New Jersey’s traffic laws.
D. To warn tourists about bicycling on the roadways.

水泵启动后不出水或出水量不足的主要原因可能是（）。

A．泵壳内有空气

B．水泵转向不对

C．叶轮进水口堵塞

D．水泵转速太低

E．吸水管漏气