单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Discovering new life in space.
B．Studying meteorites.
C．Plotting the courses of asteroids.
D．Developing radar telescopes.
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单项选择题
A．A wide selection of investments.B．A limited range of stocks.C．A group of low risk bonds and cash.D．A variety of funds.
A．A wide selection of investments.
B．A limited range of stocks.
C．A group of low risk bonds and cash.
D．A variety of funds.
填空题
Why do food-borne pathogens in Australia show low drag resistance
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