定金
参考答案：
是指当事人一方在合同成立后、履行前，依照约定时间向对方支付一定数额的金钱，以作为合同的担保，债务人履行债务后，定金抵作价款或者收回。
用所给词的适当形式填空。
Hello! Boys and girls. I'm David. I'm a reporter from School Life Radio Station. Thank you for
1_____ (listen) to me. I'm in Australia now. It's sunny today. It's a very beautiful place 2_____ (have)
fun. There 3_____ (be) lots of people here on vacation. Some 4_____ (lie) on the beach. Others
5_____ (swim) in the sea. The water is clean and blue. Look at the group of boys 6_____ (play)
beach volleyball. They 7_____ (look) cool. A girl 8_____ (sit) under the sun umbrella and drawing
pictures. Everyone 9_____ (have) a good time! What are you doing now? I hope you can
10_____ (have) a good time, too.
典型脊髓灰质炎发热呈（）
A.稽留热
B.弛张热
C.间歇热
D.双峰热
E.波浪热
