单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
The purpose of the passage is to ______.

A．introduce the importance of flags.
B．introduce the history of the US flag.
C．introduce the process of designing a flag
D．introduce the function of a national flag

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Cancer experts now believe that up to ______ of all cancers come from lifestyle factors such as smoking, diet and lack of exercise.

单项选择题

What is TRUE about Helen Keller

A．She was born in 1818.
B．She lost her seeing ability at the age of 19 months.
C．She could still hear.
D．Her teacher was not very helpful in her learning.

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. The purpose of the passage is to ______. 您的浏览器不支持 audio 元素。

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
The purpose of the passage is to ______.