2019英语专四模拟题及答案（五）

PART Ⅱ LISTENING COMPREHENSION (20 MIN)

sectionA talk(10 MIN)　　

　　In this section you will hear a talk.You will hear the talk ONCE ONLY.While listening,you may look at ANSWER SHEET ONE and write NO MORE THAN THREE WORDS for each gap.Make sure the word(s) you fill in is (are) both grammatically and semantically acceptable.You may use the blank sheet for note-taking.You have THIRTY seconds to preview the gap-filling task.

　　Now listen to the talk.When it is over, you will be given TWO minutes to complete your work.

　　[00:01.39]SECTION A TALK

　　[00:03.91]In this section you will hear a talk.

　　[00:07.28]You will hear the talk ONCE ONLY.

　　[00:10.20]While listening,

　　[00:11.71]you may look at ANSWER SHEET ONE

　　[00:14.01]and write NO MORE THAN THREE WORDS for each gap.

　　[00:18.38]Make sure the word(s) you fill in

　　[00:21.54]is (are) both grammatically and semantically acceptable.

　　[00:27.22]You may use the blank sheet for note-taking.

　　[00:30.89]You have THIRTY seconds to preview the gap-filling task.

　　[01:06.46]Now listen to the talk.

　　[01:08.63]When it is over, you will be given

　　[01:10.69]TWO minutes to complete your work.

　　[01:15.66]5 Tips to Know Before Your First Lab Class

　　[01:20.59]As students, you do much of your learning

　　[01:23.46]sitting inside a classroom,

　　[01:25.72]listening to an instructor lecture.

　　[01:28.83]Such learning can sometimes feel repetitive and boring.

　　[01:34.12]Thus, many students are excited by the fun

　　[01:37.38]and the hands-on opportunity to learn.

　　[01:40.54]However, they can also become dangerous rather quickly

　　[01:44.57]if the proper safety precautions

　　[01:46.83]and lab regulations are not respected.

　　[01:50.49]To help make sure you stay safe,

　　[01:53.26]please follow five tips

　　[01:55.27]before stepping foot inside your first lab class:

　　[01:59.65]First, make sure you understand the experiment before it starts.

　　[02:05.93]Before leading an experiment,

　　[02:08.20]your teacher will likely review the instructions that

　　[02:11.47]you and your classmates are to follow in the lab.

　　[02:15.39]Besides verbal instructions,

　　[02:17.61]you will also typically be provided with a printed guide,

　　[02:21.79]often with diagrams and illustrations,

　　[02:24.71]explaining the experiment in detail.

　　[02:27.98]While your teacher reviews the instructions,

　　[02:30.79]it's critical to follow along

　　[02:33.01]so that you know how to perform the experiment safely

　　[02:36.27]and accurately once class begins.

　　[02:39.84]Second, wearing the right kind of clothes

　　[02:43.30]and gear in the lab helps keep you safe.

　　[02:46.87]Because each experiment involves

　　[02:49.63]the use of different equipment and chemicals,

　　[02:52.35]which vary in their degree of hazard,

　　[02:54.96]your teacher should provide you with detail on

　　[02:57.88]what to wear to each class, depending on the experiment.

　　[03:02.21]In general, however, you should never

　　[03:04.87]wear open-toed shoes in the lab.

　　[03:07.89]To mitigate the chance of you catching on fire,

　　[03:11.01]remove loose clothing, like scarves,

　　[03:13.87]and roll up long sleeves.

　　[03:16.19]To that end, you should also remove any dangling jewelry,

　　[03:20.15]and if you have long hair, tie it back.

　　[03:23.22]Always wear a lab coat or apron, gloves,

　　[03:26.93]and goggles when handling chemicals.

　　[03:29.69]Third, be aware of safety equipment

　　[03:33.42]and where it's located.

　　[03:35.47]Some common types of lab safety equipment

　　[03:38.34]include emergency eye-washers and emergency showers,

　　[03:42.77]which should be used when chemicals

　　[03:44.59]get into the eyes or on one's skin; exhaust hoods,

　　[03:48.90]which are used to divert

　　[03:50.31]dangerous chemical fumes and smoke;

　　[03:52.61]and fire blankets and fire extinguishers,

　　[03:56.15]which are used to douse fire.

　　[03:58.56]You should know how to use each

　　[04:01.20]so that you can react appropriately if an accident does occur.

　　[04:06.35]Fourth, fill out your lab form

　　[04:09.34]as you conduct your experiment.

　　[04:12.05]Often, this form is part of the lab instructions.

　　[04:16.79]When conducting the lab, fill out this form

　　[04:20.06]as you go along rather than trying to remember

　　[04:23.12]everything you did in the lab

　　[04:25.43]and filling it in after class is over.

　　[04:28.44]This will help ensure you don't forget

　　[04:31.41]to record anything important,

　　[04:33.82]such as a precise measurement or detailed observation.

　　[04:38.85]Fifth, complete your lab report

　　[04:42.01]as soon as possible after the lab.

　　[04:45.13]Lab reports are a more detailed analysis of your experiment

　　[04:49.31]and how it connects to a larger scientific concept.

　　[04:53.63]Though your teacher will typically give you a few days

　　[04:56.91]to a week to finish a lab report,

　　[04:59.82]it should be much easier to complete a lab report sooner

　　[05:03.89]rather than later as the experiment's concept

　　[05:07.20]and the steps are still fresh in your mind.

　　[05:10.88]Plus, finishing your lab report early

　　[05:13.95]will give you time to reread it, and revise it when necessary.

　　[05:18.76]Last but not least, we hope that you will find these tips

　　[05:23.28]useful and enjoy your first lab class. Thank you.

　　[05:29.81]Now you have two minutes to complete your work.

　　[07:34.07]This is the end of Section A TALK.

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