单项选择题

Questions 20 to 22 are based on the passage you have just heard.

A．The volume of blood and blood pressure will drop without it.
B．It is the base for digestion and absorption of food.
C．It is responsible for regulation of body temperature.
D．It is necessary to eliminate waste out of the body.

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单项选择题A．Arranging for a meeting.B．Discussing a proposal.C．Outlining an invitation letter.D．Making an apology.

A．Arranging for a meeting.
B．Discussing a proposal.
C．Outlining an invitation letter.
D．Making an apology.

单项选择题A．25% for researching, 75% for writing.B．50% for researching, 50% for writing.C．75% for researching, 25% for writing.D．90% for researching, 10% for writing.

A．25% for researching, 75% for writing.
B．50% for researching, 50% for writing.
C．75% for researching, 25% for writing.
D．90% for researching, 10% for writing.

Questions 20 to 22 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 20 to 22 are based on the passage you have just heard.