单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Sell children’s music and art work.
B．Make videos to help protect children.
C．Produce safety equipment for children.
D．Look for missing and exploited children.

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单项选择题

All kinds of environment-sensors are designed to ______.

A．watch for signs of trouble
B．do what a vigilant driver can do
C．do what a vigilant driver can’t do
D．watch for signs of trouble out of sight

Passage One Questions 26 to 29 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Passage One
Questions 26 to 29 are based on the passage you have just heard.