各类休克的共同特点是（）
A.四肢湿冷
B.中心静脉压下降
C.血压下降
D.脉压差缩小
E.有效循环血量锐减
参考答案：E
根据句意和首字母或汉语提示，将单词的正确形式写在相应的横线上。
1. You must stop s____________, nicotine (尼古丁) is bad for your health.
2. The girl s____________ a lot of time collecting stamps last year.
3. We were glad to celebrate our motherland, China’s s__________ birthday on October 1st, 2009.
4. I like ____________ (土豆) a lot, and my mother usually cooks it in different ways.
5. Which are __________ (重的), elephants or sheep?
按搬运重量分类，中型机器人的抓重在（）范围之内。
A、1kg以下
B、1～10kg
C、10kg～30kg
D、30kg～1吨
