根据句意及汉语或首字母提示完成单词。

1. My mother invited a t _____ to teach me how to play the piano.

2. Don't be n _____ The exam is very easy.

3. We should always remember, "Practice makes p _____.

4. Look! There are _____ (几个的) boys playing basketball on the playground.

5. I have _____ (发现) that the most important requirement is to work hard if you want to get a good

   grade.

百日咳鲍特菌分离培养时宜选用何种培养基()

A．庆大培养基

B．鲍金培养基

C．BCYE培养基

D．巧克力培养基

E．L-丁培养基