今年寒假后各校都未能如期开学，宅家网上学习（learning at home online） 是大家的共同记忆。假如你叫李华，你的美国朋友David也将开始宅家学习，想 分享你这段经历，请电邮告知，主要内容是：
1.上网课的优点；
2.上网课的弊端；
3.你的感悟。
注意：1.词数100左右。首尾已给出，不计入总词数；
2.可以适当增加细节，以使行文连贯。
Hello, David!
It's sad to know that you'll have to have classes at home.
________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Best wishes!
Yours,
Li Hua
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作 文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的 噌加、删除或修改。
增加：在缺词处加一个漏字符号(∧),并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错的词下划-横线，并在该词下面写出修改后的词。
注意:1. 每处错误及其修改均仅限—词；
2.只允许修改10处，多者（从第11处起）不计分。
I’ve always been fond in collecting stamps since I was a child. As far as I'm concerned, collecting stamps is a meaningful hobby, help me to learn a lot of. Besides, dealing with my collection of stamps not only gives me great satisfactions but also helps relax yourself under the great pressure of studies. What's more, I even earned money by selling stamps and my collection will be more valuable as time goes by. Therefore, my parents are strongly against it. They consider it waste of money and they also think that sorting out my stamps may take up too much of my time, that should be spent on my studies. What can I talk them into supporting my hobby?
阅读下而材料，在空白处填入适当的内容(1个单词)或括号内单词的正确 形式。
Do you love those shoes but can't decide whether to buy the brown 1. the blue? In the near future, you may not have to decide.
A new technology from MIT's Computer Science and Artificial Intelligence Laboratory (CSALL) uses reprogrammable ink 2. (change) the color of ordinary objects. The system, named "PhotoChromeleon", uses special dyes that change color when 3. (expose) to UV light.
"This special type of dye will 4. (able) a very large number of options that could improve manufacturing efficiency and reduce overall waste," 5. (say) CSAIL postdoctoral researcher Yuhua Jin. "Users could personalize their belongings and appearance on a daily basis, 6. the need to buy the same object multiple times in different colors and styles."
Past projects 7. (involve) reversible color-change technology have only been able to go from transparent to one color and back again. PhotoChromeleon is unique because it can change between 8. (color).
"It's interesting, and it's a cool idea," says Warren Jasper, a professor of textile engineering of the MIT research. "But for it to become commercially workable, the researchers will need to deal with how to keep the colors from 9. (fade) in the sun. And if they want to scale up, they'll also need to find 10. more environmentally friendly way to get rid of the waste."
The first time I went hunting wild geese with my father, I couldn't catch them no matter how hard I tried. Every time I tried to approach them, _______ the wild geese started flying away before I could get close. It _______ me a lot and I turned to my father for help.
Hearing my trouble, my father _______ at a wild goose standing at the highest point and said, “That wild goose is a sentry （哨兵）,which we call the wild goose _______ . It will give an alarm to the other wild geese as long as it finds something _______ .
“That's _________it is so hard for you to catch them. Listen, boy! Go and _______ the slave on purpose now, and then hide there motionless."
Not quite understanding why, I _______ to have a try.
I picked up a piece of stone from the ground and threw it at the slave. As _______ , it gave an alarm to its companions __________ . The wild geese resting there fled in all __________ , but they flew back soon when they found nothing happened.
I followed my father's instructions to repeat this __________ for a few times.
____________, a few wild geese thinking they were fooled started __________ the slave. Repeatedly, almost all the wild geese thought the slave gave false __________ and began to attack the slave. The poor slave was pecked （啄）all over with cuts and scratches.
"You can approach the geese now," __________ my father.
So I got close to the wild geese again. The slave saw me, but it took no __________this time. Maybe it was just __________ caring.
__________, I raised my gun and got a good harvest.
The tragedy often occurs in this ____________: the loyal are misunderstood while the misunderstood cannot stick out.
1.A.somehow B.anyway C.somewhat D.anyhow
2.A.surprised B.touched C.annoyed D.entertained
3.A.aimed B.laughed C.stared D.pointed
4.A.father B.soldier C.slave D.leader
5.A.unlucky B.unusual C.informal D.incorrect
6.A.when B.how C.why D.where
7.A.start B.beg C.kill D.watch
8.A.refused B.offered C.pretended D.decided
9.A.suggested B.expected C.reported D.whispered
10.A.suddenly B.immediately C.carefully D.angrily
11.A.directions B.forms C.methods D.shapes
12.A.trick B.word C.plan D.idea
13.A.Actually B.Finally C.Obviously D.Especially
14.A.blaming B.teasing C.hating D.attacking
15.A.meaning B.shouting C.warning D.feeling
16.A.answered B.explained C.repeated D.reminded
17.A.courage B.notes C.action D.pictures
18.A.busy with B.tired of C.angry at D.used to
19.A.Hopeless B.Careless C.Heartless D.Speechless
20.A.way B.order C.time D.situation
For many, holiday celebrations mean large meals shared with family and friends, but such feasts can generate huge amounts of food waste, harming the environment and overusing natural resources—unless mindful merrymakers take steps to control the amount. 1.
Be mindful of what you already have
Try keeping food in glass jars. Using this method, you can make all the food in your kitchen visible, easily remembered and consumed. 2.. Nothing gets lost in the back of a shelf.
3.
Stick to a planned holiday menu before heading to the grocery store. A clear idea of who will be gathered and exactly how much food to prepare will save a lot of tossing out later. Be mindful not just of how much to purchase, but the items themselves.
Use leftovers wisely
It may be impossible to get everyone into the clean plate club. 4. Freeze and repurpose leftovers by using them as basic ingredients for other recipes or send extras home with guests.
Keep track of the scraps（残羹）
Along with turkey bones, use holiday scraps such as vegetables, meat and fish bones to make soup. For pet-safe dishes, allow your dog to clean plates before putting them in the dishwasher.
Consider composting（堆肥）
5. . These materials can be composted, which will keep them out of landfills, where they take up space and release methane, a potent greenhouse gas.
A.Shop smart
B.Plan a menu
C.That doesn't mean leftover food has to go waste
D.Some of your family or guests may not like the food
E.Following are some tips on reducing food waste during holidays
F.Organize your dry food on one row and use refrigerator drawers
G.Food scraps and yard waste make up more than 28 percent of waste
Over a million children have developed some form of intellectual （智力） disability over the past two decades after being exposed to chemicals including flame retardants, pesticides, lead, and mercury, a study has revealed.
The study focused on the four chemicals, which can be crossed from a mother to her unborn baby through the placenta（胎盘）and cause neurodevelopmental damage. The researchers looked at data from past studies, including blood samples taken from women of childbearing age and 5-year-olds.
Over the period, flame retardants, resulted in 738,860 cases of intellectual disability and an estimated 162 million lost IQ （智商）points, followed by lead at 330,684 cases, pesticides at 111,830, and mercury at 8,860. In recent years, pesticides and flame retardants have overtaken lead and mercury as the chemicals responsible for the biggest loss of IQ among children.
The researchers believe this is due to regulations cutting down the use of these chemicals. For instance, lead has been banned from gasoline, paint and drinking water systems in the U.S. and plants are not allowed to pump out mercury.
The researchers acknowledged limitations to their study, including that the exposure-response relationships might not relate to all populations. Positively, they found a huge drop in the estimated loss of IQ points among children.
Lead researcher Abigail Gaylord, commented: "Our findings suggest that our efforts to reduce exposure to heavy metals are paying off, but that harmful exposures in general continue to represent a terrible risk to people's physical, mental, and economic health. "Unfortunately, the minimal policies in place to remove pesticides and flame retardants are clearly not enough," she said.
She also added. Frequently opening windows to let persistent chemicals found in furniture electronics, and carpeting escape, and eating certified organic produce can educe exposure to these harmful things"
1.Which contributes most to the loss of children's IQ?
A.Flame retardants. B.Pesticide.
C.Lead. D.Mercury.
2.Where does the passage probably come from?
A.A school report. B.A science fiction.
C.A scientific research. D.A chemistry book.
3.What is the drawback of the research mentioned?
A.It has received bad response from all populations.
B.It has no previous information to refer to.
C.It covers only part of the population.
D.It is not supported by government policies.
4.What's the best title for this passage?
A.Four chemicals harming children.
B.Regulations cutting down the use of heavy metals.
C.Environment risking people's physical and mental health.
D.Children IQ lowered by exposure to harmful chemicals.
