单项选择题

Questions 1 to 4 are based on the conversation you have just heard.

A．The collection of precious metals.
B．A standard measuring weight unit.
C．The value of precious metals.
D．A new metric system of measurement.

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单项选择题

Questions 1 to 4 are based on the conversation you have just heard.

A．The collection of precious metals.
B．A standard measuring weight unit.
C．The value of precious metals.
D．A new metric system of measurement.

单项选择题

Questions 5 to 8 are based on the conversation you have just heard.

A．She is busy writing a biological article.
B．She is busy with a program about endangered species.
C．She is busy reading some books on economics.
D．She is busy with two research papers.

单项选择题

Questions 1 to 4 are based on the conversation you have just heard.

A．Checking the accuracy of scales.
B．Calculating the density of metals.
C．Observing humidity of atmosphere.
D．Measuring amounts of rainfall.

单项选择题

Questions 5 to 8 are based on the conversation you have just heard.

A．Some species are impossible to conserve.
B．People are less conscious of saving endangered species.
C．Funds are difficult to get to conserve endangered species.
D．It is difficult to determine which animals are endangered.

单项选择题

Questions 1 to 4 are based on the conversation you have just heard.

A．It has been rusty.
B．It was not scientific.
C．It was of low quality.
D．It was out of date.

单项选择题

Questions 1 to 4 are based on the conversation you have just heard.

A．It is very cheap.
B．It is difficult to say.
C．It is too expensive.
D．It is reasonable.

单项选择题

Questions 5 to 8 are based on the conversation you have just heard.

A．The relatives of the tailed toad have been extinct.
B．The varieties of the tailed toad are helpful to the research of evolution.
C．If the tailed toad is well conserved, many other species will be better saved.
D．If the tailed toad was extinct, some myth about evolution would lose.

单项选择题

Questions 5 to 8 are based on the conversation you have just heard.

A．The man is busy preparing the research paper.
B．The woman should hand two papers in on the same day.
C．The man is reading a hook only about biology.
D．The woman is glad to make a decision on which animal to save.