芦荟，《新华字典》的解释是：“一种多年生常绿草本植物(Aloe vera var．chinensis)。叶大而肥厚、基出、簇生、狭长披针形，花黄色或有赤色斑点，多产于热带地方。叶边缘有尖锐的锯齿，花像穗子，叶汁可入药”。以下关于芦荟用途的描述，正确的是( )。
A．强心活血作用
B．健胃止泻作用
C．湿润美容作用
D．免疫与抗肿瘤作用
参考答案：A,C,D
解析： 芦荟中的芦荟大黄素甙、芦荟大黄素等有效成分起着增进食欲、大肠缓泄的作用。服用适量芦荟，能强化胃功能，增强体质，因厌食症致虚而失去食欲的病危患者，服用芦荟也能恢复食欲，芦荟也是治疗实热型便秘比较有效的药物，故选ACD。
| 补全对话。 | |
B: I've just been to the Three Gorges (三峡). A: Really? 2 B: Right. As you know, we've built a great dam (坝) across the Changjiang river. A: 3 B: Yes, the dam is stopping water these days. And the water is rising 2 meters every day until it is 135 meters high. A: Oh, no wonder (难怪) it's said that the beautiful scenery of Kuimen will be under water. What a pity! B: 4 It has copied in another place with some other places of interest. A: Great! I want to go to the Three Gorges this summer. Would you like to go there with me again? B: I'd love to! 5 1. _________ 2. __________ 3. ___________ 4. ___________ 5. ___________ |