操作时耳听引擎声，眼看井口，手握刹把和离合器、平稳操作，要预防（）现象。
参考答案：顿、刮、碰
下列哪项数值提示胎儿肾已成熟
A．羊水中HPL值＞4mg/LB．羊水中肌酐值≥3mgEC．羊水中肌酐值≥176.8μmol/LD．羊水中肌酐值≥180.8μmol/LE．孕妇尿中E/C比值＞15
第二节：短语填空（共5小题，每小题1分，满分5分）
He has ever _______________ the long jump in the Olympics three times. (参加)
The changes are an improvement ______________. (在某种程度上)
Tribes and tribal customs ____________ centuries ago. (消失，灭绝)
When I am back to school from sick leave, I will _____________（弥补）for the missing lessons.
Sentences can be ___________ (分解) into phrases and phrases into words.
