题目内容

【题目】病毒疫苗和抗血清(含特异性抗体的血清)在现代免疫学预防、治疗中有重要作用。下列分析中正确的是

A.消灭人体内病毒只需B淋巴细胞和T淋巴细胞参与

B.一种浆细胞可能产生多种抗体

C.人体接种病毒疫苗获得相应免疫力属于非特异性免疫

D.以患病后经治愈的人的血清来治愈患同种病毒感染的重症患者不属于二次免疫

【答案】D

【解析】A、消灭人体内病毒需要体液免疫和细胞免疫共同参与,需要吞噬细胞、B淋巴细胞、T淋巴细胞、效应B细胞、效应T细胞等,故A错误;B、一个效应B淋巴细胞只能产生一种特异性抗体,故B错误;C、人体接种病毒疫苗,使得机体产生抗体和记忆细胞,获得相应免疫力属于特异性免疫,故C错误;D、血清中含有抗体,以抗血清治疗病毒性重症患者说明该患者无相应抗体,不属于二次免疫,故D正确。

练习册系列答案
相关题目

【题目】B

People are interested in eating raw and whole foods (天然健康食品). They are usually digested more efficiently than cooked and processed foods. When we cook foods, we destroy the natural enzymes (酶) that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients (营养) to be absorbed into the blood. In both cases, the result is obesity.

Processed foods contain chemical elements, which might confuse the stomach that tells us when we’ve had enough to eat; as a result, people often overeat. Processed foods also upset the digestion cycle. Then, the body’s metabolism (新陈代谢) becomes inactive, and the result is weight gain and obesity.

To stop this vicious circle in its tracks, people need to have healthy food that will balance the body. Eating the right types of raw and whole foods can help. It’s also important to restore our enzyme balance. We need to tell and avoid the foods that cause negative effects and eat the foods that increase enzyme production. If we truly want to change and help our body heal itself, we need to take an active approach.

【1】What can we learn from Paragraph 1?

A. It is essential for us to digest some fat.

B. Cooked and processed foods are healthier.

C. Foods with natural enzymes help us keep fit.

D. Absorbing many nutrients is beneficial to our health.

【2】Processed foods will probably __________.

A. stop body’s metabolism B. be difficult to digest

C. destroy body’s cells D. lead to obesity

【3】 What does the underlined word “vicious” in the last paragraph mean?

A. Harmful. B. Violent.

C. Automatic. D. Positive.

【题目】Passage 2

体裁

话题

词数

难度

建议时间

说明文

泰姬陵

270

★★☆☆

5分钟

The Taj Mahal(泰姬陵) is a love story, a sad and beautiful one. If it didn’t exist, we would easily imagine that the story of its construction was simply a fairy tale. Three hundred years ago, there lived an Indian emperor called Shah Jahan. His wife was a beautiful and bright woman whom he loved greatly. Her title was Mumtaz Mahal: its shortened form Taj Mahal, means "pride of the palace". In the year 1630 this beloved wife of the emperor died. He was so broken-hearted that he thought of giving up his throne. He decided out of his love for his wife to build her the most beautiful tomb that had ever been seen.

He invited the best artists and architects from India, Turkey, Persia and Arabia and finally, the design was completed. It took more than twenty thousand men working over a period of 18 years to build the Taj Mahal, one of the most beautiful buildings in the world.

The building itself stands on a marble platform, 29 metres square and 67 metres high. Towers rise from each of the four corners. The Taj itself soars another 61 metres into the air. It is an eight-sided building made of white marble.

The emperor planned to build an identical tomb of black marble for himself on the other side of the river connected by a silver bridge. However his son put him into a prison in the palace before he could finish, and for the rest of his life, he could only gaze across river at the tomb of his beloved wife.

【1】 The whole passage tells us about_____________.

A. a beautiful fairy tale

B. the story of the Taj Mahal

C. white and black marble tombs made for two emperors

D. the love story of emperor Shah Jahan and his wife

【2】We know from the text that _____________.

A. the Taj Mahal was completed quickly

B. only experts took part in the building work

C. the Taj Mahal is a magnificent building for a king

D. the Taj Mahal is a tomb for the emperor’s beloved wife

【3】 The emperor’s own tomb was designed to be ____________.

A. 61 metres high B. eight-sided

C. black-coloured D. white-coloured

【4】The text tells us that the emperor ____________.

A. died soon after Taj Mahal died B. was killed by his son

C. was beloved by his people D. died after 1648

【题目】Passage 1

体裁

话题

词数

难度

建议时间

记叙

救助猫头鹰

296

★★★

4分钟

(2017·新课标全国卷I)I work with Volunteers for Wildlife, a rescue and education organization at Bailey Arboretum in Locust Valley. Trying to help injured, displaced or sick creatures can be heartbreaking; survival is never certain. However, when it works, it is simply beautiful.

I got a rescue call from a woman in Muttontown. She had found a young owl(猫头鹰) on the ground. When I arrived, I saw a 2-to 3-week-old owl. It had already been placed in a carrier for safety.

I examined the chick(雏鸟) and it seemed fine. If I could locate the nest, I might have been able to put it back, but no luck. My next work was to construct a nest and anchor it in a tree.

The homeowner was very helpful. A wire basket was found. I put some pine branches into the basket to make this nest safe and comfortable. I placed the chick in the nest, and it quickly calmed down.

Now all that was needed were the parents, but they were absent. I gave the homeowner a recording of the hunger screams of owl chicks. These advertise the presence of chicks to adults; they might also encourage our chick to start calling as well. I gave the owner as much information as possible and headed home to see what news the night might bring.

A nervous night to be sure, but sometimes the spirits of nature smile on us all! The homeowner called to say that the parents had responded to the recordings. I drove over and saw the chick in the nest looking healthy and active. And it was accompanied in the nest by the greatest sight of all LUNCH! The parents had done their duty and would probably continue to do so.

【1】What is unavoidable in the author’s rescue work according to paragraph 1?

A. Efforts made in vain.

B. Getting injured in his work.

C. Feeling uncertain about his future.

D. Creatures forced out of their homes.

【2】Why was the author called to Muttontown?

A. To rescue a woman.

B. To take care of a woman.

C. To look at a baby owl.

D. To cure a young owl.

【3】 What made the chick calm down?

A. A new nest. B. Some food.

C. A recording. D. Its parents.

【4】How would the author feel about the outcome of the event?

A. It’s unexpected. B. It’s beautiful.

C. It’s humorous. D. It’s discouraging.

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网