参考答案:Now let’s discuss what they have in common in small groups. Remember to use some of the following expressions. I think that ... In my opinion ... I believe that ... What’s your opinion Why do you think so Step 2. Listening Students are asked to read fast the requirement of Ex. 1 and to find out the listening points first. Then listen to the tape twice to complete Ex 1 . Step 3. Talking Imagine that your family is thinking of buying a robot. You can afford the three robots mentioned in the listening text. Please discuss which one is the best for you. Remember to discuss the advantages and disadvantages of each one. Then make your choice and give reasons. Use the following expressions in the discussion: I believe that ... I think this one is better because ... Let’s make our decision . . . In my opinion ... I’ve decided . . . I don’t like this one because ...
第18题: [单项选择]现在所知道的最高一级天体系统（） A. 是整个宇宙 B. 以太阳为中心 C. 是太阳系和银河系的总称 D. 其半径大约为140亿光年 参考答案:D
第19题: [单项选择]急性肺水肿的特征性症状为（） A. 气促、发绀、烦躁不安 B. 肺动脉瓣区出现第二心音分裂 C. 咳粉红色泡沫痰，肺部哮鸣音和湿啰音 D. 心尖区舒展期奔马律 E. 下肢浮肿 参考答案:C
