单项选择题

What can we infer from this discussion

A．That Bob does not get along with his lab partner.
B．That the students performed the experiment correctly.
C．That the students had problems, and could not complete the lab experiment.
D．That there was a fire in the lab during the experiment.

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问答题

Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be read at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be read at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more. Please write the whole passage on ANSWER SHEET ONE.

单项选择题

The attempt to help blind people to see with sound ________.

A．was similar to the sound location system of the bats
B．led to a product that sent out sound waves of about 20,000 cycles per second
C．was experimented on a submarine
D．turned out to be a failure