单项选择题

The sellers signed the________ promising to ship the goods before the end of July.

A．contact
B．treaty
C．agreement
D．contract
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单项选择题
If children have flu-like symptoms, their parents________.
A．are advised not to give them aspirin
B．should watch out for signs of Reye syndrome
C．are encouraged to take them to hospital for vaccination
D．should prevent them from mixing with people running a fever
单项选择题
Which of the following symptoms will distinguish the flu from a cold
A．A stuffy nose.
B．A high temperature.
C．A sore throat.
D．A dry cough.
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