在遇到巨大声响时,迅速张开口或闭嘴堵耳,这样做目的是 A.防止声音入耳B.使鼓膜内侧气压大于鼓膜外侧气压C.防止灰尘入耳D.维持鼓膜两侧气压平衡 答案:D解析:略
Listen and choose. 听录音,选出你听到的单词或词组。
( ) 1. A. breakfast ( ) 2. A. skirt ( ) 3. A. new shoes ( ) 4. A. Tuesday ( ) 5. A. a pair of shorts
B. lunch B. shoes B. new shorts B. Wednesday B. a pair of socks
C. supper C. shirt C. old shoes C. Thursday C. a pair of shoes