单项选择题

How was the weight used

A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.

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单项选择题What will the woman receive if she is chosen

A．A certificate signed by three professors.
B．A cash award and a certificate,
C．A medal worth five hundred dollars.
D．An opportunity to interview for an excellent position.

单项选择题What is the main topic of the conversation

A．The woman's performance in her classes.
B．The woman's nomination for an award.
C．The professor's offer to help prepare the woman for an interview.
D．The results of the professor's meeting with the woman's other teachers.