镫骨肌反射
参考答案:强声(听阈上70~100 dB)刺激引起镫骨肌反射性收缩,使鼓膜、听骨链的劲度增加,从而减少声音向内耳的传导,这一过程称为镫骨肌反射。
情景交际选一选。
1. 你的新老师很幽默风趣,你可以说:[ ]
A. My new teacher is heavy.
B. My new teacher is funny.
C. My new teacher is a young man.
2. 同学问你星期三有什么课,你可以回答:[ ]
A. We have English and music lesson on Wednesdays.
B. I have eggplant for lunch on Wednesdays.
C. They have English and music on Thursdays.
3. 下面对苹果的评价正确的是:[ ]
A. The apples are salty and yummy.
B. The apples are sweet and yummy.
C. The apples are not healthy.
4. 别人问你最喜欢的水果是什么,你可以回答:[ ]
A. I like mutton.
B. like grapes.
C. Bananas.
5. 当你收到同学送你的生日礼物时,你可以说:[ ]
A. You are so good!
B. Thank you. I like it very much.
C. I don't like it.
“劳动生产力上最大的增进,以及运用劳动时所表现的更大的熟练、技巧和判断力,似乎都是分工的结果。”亚当·斯密的这句话说明()
A.提高劳动生产率的主要途径是分工
B.分工决定交换,而不是交换决定分工
C.市场作用发挥越充分,越有利于分工发展
D.国民财富的增长取决于劳动生产率的提高