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(1)物质B的化学本质是 ______________。
(2)物质A为____________,是由效应T细胞分泌,又能诱导生成更多的效应_________ 细胞,这是一种____________调节机制。
(3)效应T细胞与靶细胞密切接触,激活靶细胞内的_____________,并使其通透性、渗透压发生改变,最终___________,释放出病毒与抗体结合,使病毒失去_________________________宿主细胞的能力。
(4)T细胞由__________分化而来,成熟于______________,并随血液和淋巴在体内流动。T细胞在人体免疫应答中除具有图示增殖分化的功能外,还能 ______________。 查看习题详情和答案>>
B)根据短文内容及首字母提示,填写所缺单词。![]()
It happens to most of us at times as we try to get through our workday. When sitting at work, we suddenly f 1 a bit headache. But don’t worry; there are some simple things that you can do to ease(减轻) a headache at work w 2 medicine.
Drink a bottle of warm water. Many people do not r 3 that the dry air in their working place can be a danger because of the lack(缺少) of water.
Eat a h 4 snack. During a busy day, it is easy to f 5 to eat, have a snack with much protein(蛋白质) which will improve your e 6 and quickly get rid of the hunger that is c 7 the headache. A cup of coffee or a piece of chocolate can be just the thing that you n 8 to ease your headache fast and get back on your way to a great day at work.
Step away from what you are working on for five to ten m 9 . Often, your headache is from your too much a 10 paid to one thing. This can be a computer screen or even one project. The best thing would be to go outside for your eyes to get some natural light.
B)根据短文内容及首字母提示,填写所缺单词。
Be a potato, but be the best
A young college student thought that he chose the wrong major (专业) at a common college, so he drank every day and didn’t study at all. He b 1 more and more discouraged.
But he was never a 2 from Professor Yang’s biology (生物) class. He liked the course. Besides, Yang’s class was so i 3 that he always listened carefully, never caring about w 4 the other students were paying attention or not in class.
Once he put a note in the homework he handed in, saying: “Professor, it is said that today’s college students are c 5 than potatoes. Do you agree?”
That day Professor Yang sent for him after class. When he came, he f 6 the professor at a table with food on it. They drank happily over their meal.
When they became half drunk, the professor took out a small potato that was sprouting (发芽的). “Do you know how much this c 7 ?” he asked the young man. “It’s soft but poisonous. N 8 will take it even if it’s free. ” He then threw the potato away.
The professor then showed him another potato. It was half the s 9 of a football and perfectly round. “This potato is organic (有机的). It is not only large and fresh but also free of pollution. People are in need of such k 10 of potatoes and they’re quite expensive.”
The young man was impressed by what he’d heard. “Be such a potato,” said the professor.
B) 根据短文内容及首字母提示,填写所缺单词。
One cold midnight after the birthday party of Tom’s, my husband Jack and I were driving home w 【小题1】 suddenly our car stopped. “We’ve covered half the way.” I said. “There must be something wrong with the car. I can’t start it again,” said Jack.
What a car! We got out to look around f 【小题2】 help, but could there be any person at s【小题3】 an hour? It was dark and nothing could be done to make it go. We h 【小题4】 to walk home. We knew it would take us 2 hours to get home on foot, and we were so tired. But what else could take us home? It was so c 【小题5】 in the car. At once we began to walk home.
We were at the door at about 2:30 when I r 【小题6】 that I had left the key in the car! How s 【小题7】 it is! “Break the window and climb in.” said Jack. He picked up a stone, broke the window and was ready to climb when someone from behind caught Jack by the a 【小题8】 . It was a policeman!
“What are you going to do, man?” he asked. “Come with me to the police s 【小题9】 , you two!”
I told him the whole story. At last he understood what I had said and I was a 【小题10】 to get in.
It was three o’clock in the morning!
B.根据短文内容及首字母提示完成短文(每空一词)
Recently a lot of people have been punished for speaking on their mobile phones while driving. S 1 on the phone requires concentration(集中,专心) and takes a driver’s a 2 from the road.If you drive after you have consumed alcoholic(含酒精的) drinks, you are a 3 the law and risking your own life as well as the lives of o 4 . If you are with someone else who has been drinking alcohol, even i 5 they had just a glass of beer, do not a 6 them to drive.
There is a fact that driving too fast through city streets is very irresponsible and d 7 . Our city streets are always b 8 with people, cars and bicycles. Drivers have to take the responsibility(责任) to be c 9 _ for people crossing the road, especially older people who may walks 10 and young children who may not look before stepping into the road.