2017年5月6日托福听力机经小范围预测，跟着
点击获得
本次网除了提供托福听力机经，还提供了、以及。
2017年5月6日托福考试听力机经之真题测练(部分内容)：
Chemistry (150131 CN L2 )
题目：
1. What is the main purpose of the lecture?
A. To discuss the advantages of heating substances in microwave ovens
B. To discuss recent research that may lead to improved microwave ovens
C. To point out problems in the use of superheating to produce medicines
D. To prepare students for upcoming experiments in the laboratory
2. Why does the professor talk about making coffee?
A. To describe how he dissolved coffee particles to prevent nucleation
B. To introduce the concept of microwave superheating
C. To reassure the students that some of the experiments will be as simple as making coffee
D. To warn the students not to superheat liquids containing dissolved chemicals
3. Why does the professor mention that once nucleation has occurred, added heat is used to convert liquid water into water vapor?
A. To explain why the temperature of water does not rise beyond the boiling point when water is heated in a metal pot on a stove
B. To point out similarities in heating liquids using microwave ovens and using conventional stoves
C. To explain why water that is exposed to microwaves will appear to be hot when it really is not
D. To point out that it is better to avoid making coffee in a microwave oven
4. The professor talks about using microwave ovens for superheating during the students' laboratory experiments. What two possible results of superheating does he mention?
Click on 2 answers.
A. An increased flow of electrical current through the superheated liquid
B. An acceleration of reaction between chemicals in the superheated liquid
C. The decomposition of chemicals in the superheated liquid
D. The creation of tiny scratches and dents on the interior surface of the container
5. What is the professor's attitude about the use of microwave ovens by pharmaceutical companies in the production of medicines?
A. The use of microwave ovens is hazardous because it prevents control of temperatures.
B. The use of microwave ovens produces satisfactory results but is not worth the added expense.
C. The use of microwave ovens may allow companies to produce medicines more efficiently than traditional heating methods do.
D. More research should be done before replacing traditional heating equipment with microwave ovens.
本文的内容就是2017年5月6日托福听力机经小范围预测。
6. According to the professor, what two laboratory practices that are used by pharmaceutical companies will students also use in their experiments?
Click on 2 answers.
A. Using containers that have been developed to ensure nucleation
B. Using a new type of microwave to superheat all liquids
C. Using smooth containers that have been specially designed for microwave use
D. Using sealed containers to allow the pressure inside to increase during heating
托福听力话题预测：
| 场景特点： | 时间比较久远的事件或事物 |
| 常见套路： |
（1）某个历史时期的介绍（特点、大事件、事件意义） （2）某种事物的发展进程（犁、茶叶、日历、淘金热、羊皮纸、部落、青铜器、蒸汽机等） |
| 场景词汇： | champion声援、捍卫；envision想象、预见、展望；emerge出現、浮现；myth神话、虚构的人/物；ritual 仪式、典礼；perceive察觉、发觉、理解；well-being幸福、生活安宁；attribute 把…归功于；desirable令人满意的；formalize使…成为正式；supernatural超自然的、神奇的；mythical神话的、虚构的；sophisticated精致的、复杂的；abandon放弃、抛弃；modify修改；rite仪式、典礼；autonomous自治的、独立自主的；aesthetic美的、审美的；origin起源、起端；alternative二中选一、可供选择的事物；fundamental 基本的；elaborate详尽阐述、详尽说明；evolve进化、发展；imitation模仿、仿效；motivation动机、动力；motive动机、主旨cease 停止；fulfill 履行、 执行；objectify使客观化；instinct本能、天性；detach 分离、拆开；comic 喜剧的、滑稽的；ridiculous可笑的；荒谬的；welfare福利；retain获得、达到；artistic艺术的、观感的 |