[题目]屠呦呦已经把所有的空余时间都花在从植物中提取青嵩素了.Tu Youyou Artemisinin from plants. 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】屠呦呦已经把所有的空余时间都花在从植物中提取青嵩素了。

Tu Youyou ___________________ Artemisinin from plants.

【答案】has devoted all her free/spare time to getting/ has spent all her free time getting

【解析】

通过中英文句子的比对，可知英文句子中缺少"…提取…"的表达。句子叙述过去发生的事情对现在造成的影响，时态应该用现在完成时，构成：have/has+动词的过去分词，短语"所有的空余时间"的英文表达是 all her spare time，devote time to doing sth表示致力于做某事，提取用get表示，这里主语是TuYouyou，所以助动词应该用has，故答案为：has devoted all her free/spare time to getting/ has spent all her free time getting。

练习册系列答案

A 2013 study found the answer. Researchers at the LS University of Rochester studied the brains of mice and discovered that they cleaned themselves while the mice slept. A kind of fluid in the brain, called cerebral spinal fluid (CSF, 脑脊液), was found to increase dramatically (显著地) during sleep, washing away waste proteins that had been building up between brain cells in waking hours.

"This study shows that the brain has different functional stales when asleep and when awake," Maiken Nedergaard, the lead researcher, told NBC News. It also explains why we can't seem to think clearly after a sleepless night while a good night's sleep leaves us feeling sharp and refreshed.

Now a new study, published on Oct 31 in Science, digs a little deeper into our brains' self-cleaning procedure. Instead of mice, this time humans were the test subjects.

Researchers at Boston University, US, monitored (监测) the brain waves of 13 healthy adults who were sleeping, using accelerated MRI, which is capable of recording faster changes inside the brain than a regular MRI machine. They found that every 20 seconds, blood flowed out of the brain, making room for a large amount of CSF to come in and "clean". This cycle coincided with(与……一致) the rhythm of the brain's slow waves-an electrical activity that happens when we're in deep sleep.

It's still unknown how these brain activities are connected. But the mere fact that they are connected is exciting enough, since it allows researchers to piece together (拼凑出) possible new explanations for misunderstood diseases.

For example, slow-wave sleep has been proven to play a role in strengthening our memories. This may explain why people with Alzheimer's often have fewer and weaker slow brainwaves. Based on this new study, there could be one more explanation for diseased brains: They are not clean.

Nedergaard, leader of the 2013 study, is also excited about the new findings. "Maybe the most important take-home message is that sleep is a serious thing," she told Scientific American. "You really need to sleep to keep a healthy brain because it links electrical activity to a practical 'housekeeping' function."

【1】When the researchers studied the brains of mice, they found __________.

A.CSF in their brains went down when the mice slept

B.CSF carried away waste proteins in their brain during sleep

C.more waste proteins were produced in their brains when asleep

D.the more CSF was in their brains, the fewer waste proteins were

【2】What did the researchers discover when they monitored human brain waves?

A.The rhythm of the brain was slower than that of CSF.

B.The brains worked more slowly when asleep.

C.Brains were cleaned when blood flowed out.

D.It took 20 seconds for CSF to clean brains.

【3】Which of the following would be the best title for the passage?

A.Connecting Brain ActivitiesB.Cleaning in Your Dreams

C.Having a Good SleepD.Explaining Diseases

【题目】 Three days after the terrible earthquake, I was working in my home office. Just then I got a(n) _______: To show national unity(国家凝聚力), please stop for a minute at 7:00 p.m. on Thursday, and _______ outside your home or place of business and light a candle for peace.

I was _______ by the idea. I got two candles for my husband and myself from the kitchen. Then I went back and got two more, because I decided to ask the young _______ who lived next door to join us. They were expecting their first child soon. I was sure that they would be _______ to join us. In the afternoon, I _______ the e-mail to my friends and workmates.

When I stepped out the door at 6:50 p.m., more than forty people were coming from both directions, and most of them were carrying flags _______ their candles.

Our service was brief(简洁的)_______ meaningful. After singing the national song, some young men led us to sing“Ode to the Motherland”.In the end, we raised a lot of money for the earthquake survivors(幸存者).

The activity makes me realize we should _______ people to serve for others. If we get ________, we can overcome all the difficulties.

【1】A.letterB.callC.invitationD.e-mail

【2】A.walkB.pushC.watchD.enjoy

【3】A.scaredB.shockedC.movedD.surprised

【4】A.girlsB.coupleC.ladiesD.workers

【5】A.gladB.boredC.tiredD.sorry

【6】A.forcedB.deletedC.canceledD.sent

【7】A.forB.inC.withD.at

【8】A.soB.butC.andD.or

【9】A.preventB.remainC.supposeD.encourage

【10】A.togetherB.overC.upD.down

【题目】So far China ________ a lot of goods and materials（物资）to some foreign countries.

A.will give offB.gave inC.has given awayD.gave up

【题目】come, I, our, true, will, believe, dream

____________________________________________________.

【题目】Behind every successful man there are a lot of unsuccessful years. So dear students, don't give up when you meet with difficulties. Try ________second time, and success will finally belong to you.

A.aB.theC./

【题目】Frank made a survey about hobbies in his class which has half boys and half girls. All forty-seven of his classmates each have a hobby besides him. So ________students dislike ball games in his class.

	Boys		Girls
Hobby	Football	Jogging	Reading	Table tennis
Percent	1/3	2/3	3/4	1/4

A.34B.8C.14

【题目】—You are always on time for everything. How ________ it be that you were late for the meeting this morning?

—Something went wrong with my car. But I didn’t know it before I left home.

A.shouldB.couldC.mightD.must

【题目】 Once upon a time there was no tea at all in England. People there used to drink a light beer. No coffee or milk but large glasses of beer stood on the breakfast table.

When tea was first brought to England, an old couple got some as a special treat. But they do not know how it should be used. They cooked the leaves in hot water, and spread them on a piece of bacon (熏肉) which they were going to have for dinner. They ate the leaves, and threw the tea away! However, tea is becoming as popular as coffee and milk in England today.

Tea is the leaf of a plant which grows widely in China, Japan and some other countries. Tea farmers usually grow many tea plants on a large piece of land. When the leaves are ready to be picked, it is the busiest time for tea farmers in a year. They pull off the leaves and dry them. In their spare time, they pick out the best leaves and get them ready for market. In China, whenever a visitor comes into house, he is served with a cup of tea.

【1】Beer was served for breakfast in England long ago.

【2】Tea was first brought to England by an old couple.

【3】The old couple threw the tea leaves away and enjoyed tea.

【4】Tea farmers are the busiest in a year when they pick and dry tea leaves.

【5】Tea, coffee and milk are all popular in England today.

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