单项选择题

SECTION A CONVERSATIONS In this section you will hear three conversations. Each will be read only once. At the end of the conversation you will be given 10 seconds to choose the answer which is the closest in the meaning to the conversation you have just heard. Now listen to the conversations. Questionsl-4 are based on the following conversation. What does a "we should allow for a marginal error" mean

A．You should plan for delays.
B．You should cut everything closely.
C．You shouldn’t make any mistakes when going for and appointment.
D．You should always be punctual:
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单项选择题
What did the electronic message system do
A．It trained American athletes.
B．It helped keep the journalists informed of the results.
C．It kept track of schedules.
D．It made the judges’ decisions final.
单项选择题
The girl’s second suggestion is about______.
A．separating different types of garbage
B．disposing of trash properly
C．having a family clean-up party
D．disposing of batteries properly
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