进行单侧唇裂（如图）整复术最适合的年龄为（）。 A.出生后即刻 B.1～2个月 C.

“What did the teacher tell you to do? ”  “I have to write a __ composition.”

A．two-thousand-word

B．two-thousand-word

C．two-thousands-words

D．two-thousand-words

The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage.

The complex life cycle of the Plasmodium protozoan, the causative agent of malaria, has contributed to the difficulty of devising effective public health measures to combat the disease. It took scientists centuries to deconstruct the basic relationship between protozoan, mosquito vector, and human host. Modern physiologists and epidemiologists are still working out the intricacies of malarial infection.

The disease is transmitted by the bite of a female Anopheles mosquito infected with the Plasmodium parasite. Only Anopheles mosquitoes are capable of transmitting the disease, and only females take blood meals from humans. To become infected with Plasmodium, the female mosquito takes a blood meal from a human carrying the parasite in his or her blood. Once ingested, the parasite matures in the mosquito’s gut for approximately a week, after which it migrates to the insect’s salivary glands. By mixing with the mosquito’s saliva, the parasite facilitates its transmission to a human host when the mosquito bites that human.

Once in a human’s bloodstream, the parasite travels to the human’s liver. At this initial stage, the Plasmodium parasite is called a sporozoite. Within the liver, the sporozoite can form 30,000 to 40,000 daughter cells, called merozoites, which are released into the host’s bloodstream at a later date, sometimes within a week of the initial infection and sometimes as much as several months later. The merozoites seek out and attach themselves to red blood cells, in which they incubate 8 to 24 daughter cells over the next two days. When the daughter cells are mature, the red blood cell ruptures and the new parasites are released into the bloodstream to seek out red blood cells of their own. Some of the new merozoites become male and female gametocytes; if these gametocytes are ingested by a mosquito feeding on the host’s blood, they will fertilize in the mosquito’s gut to produce new sporozoites, and the cycle will continue.

The symptoms that we associate with malaria--a high, recurring fever; joint pain; a swollen spleen--are caused by toxins released from the red blood cells ruptured by merozoites. The human spleen can destroy these infected blood cells, but the Plasmodium parasite counters this effect by increasing the stickiness of proteins on the blood cells’ surfaces so that the cells stick to the walls of blood vessels. If the sticky surface proteins affect a particularly large number of cells, the malaria can trans-form into a hemorrhagic fever, the most deadly form of malaria.

A further complicating factor in the natural history of malaria is the many variants of the Plasmodium protozoan. Scientists now recognize that malaria is caused by at least six different species: P. falciparum, P. vivax, P. ovale, P. malariae, P. knowesli, and P. semiovale. Of these species, P. falciparum accounts for the majority of infections and approximately 90 percent of malarial deaths in the world.

The passage is primarily concerned with which of the following ？（）

A. Describing the life cycle of the Plasmodium protozoan as it relates to the disease malaria

B. Comparing and contrasting the life cycles of the six variants of the Plasmodium protozoan known to cause malaria

C. Addressing the public health implications of the life cycle of the Plasmodium parasite

D. Providing information on how a person can avoid infection with malaria

E. Describing the life cycle of the Anopheles mosquito as it relates to the transmission of the Plasmodium protozoan to humans

霍夫曼定律

时脉冲的缩写表示（）。

A.pps

B.ppm

C.pph

D.ppt

患者，女，26岁，G₂P₀，孕31周，恶心、呕吐伴不规律下腹坠痛10小时而入院。一般情况尚可．T37.3℃，BP120／80mmHg，P90次／分，R20次／分；心肺未见异常，妊娠腹型，肝脾未及；剑突下右侧轻压痛，无反跳痛，麦氏点无压痛。有不规律宫缩，宫体部无压痛，宫缩间歇期子宫完全松弛。宫高29cm，腹围88cm，LOA，胎心率144次／分，骨盆外测量无异常。肛查：宫颈未消先露头浮。入院后进行必要的实验室检查如血尿常规检测，请外科会诊，最后诊断为妊娠合并急性阑尾炎。

术中是否置引流（）

A.尽可能不放置引流

B.最好短时置盆腔引流

C.最好短时置腹腔引流

D.最好置盆腔引流

E.最好置腹腔引流