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问题 单项选择题 A1/A2型题

早期动脉粥样硬化病变，最早进入动脉内膜的细胞是（）

A.红细胞

B.淋巴细胞

C.脂肪细胞

D.中性粒细胞

E.巨噬细胞

答案

参考答案：E

解析：在动脉粥样硬化病变早期，单核细胞可在内皮细胞表达的黏附因子的作用下黏附于内皮细胞表面，并在趋化因子作用下进入内膜，转化为巨噬细胞，进而形成泡沫细胞，这是动脉粥样硬化病变早期脂纹、脂斑的主要成分。故选E。

选择题

化学老师出了一条谜语：看不见，摸不着，越往高处越稀少，生命活动离不了--打一物质．你猜谜底是 （　　）

A．N2

B．O2

C．H2

D．CO2
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填空题


Health officials in western Siberia are to begin in slaughter of thousands of birds today after identifying Russia’s first outbreak of a bird flu strain that can be fatal in humans. Doctors in neighboring Kazakhstan have also (1) that a 19-year-old poultry worker (2) admitted to hospital with (3) of bird flu, only to be diagnosed (4) double pneumonia.
The H5N1 strain of avian (5) has killed 60 people (6) 2fib in Vietnam, Thailand, Cambodia and Indonesia, but has rarely been found in birds or humans (7) Asia.
Health officials (8) that HSN1 is infecting migrating birds, which could spread the (9) into Europe. Earlier this year China registered the first outbreak of H5N1 (10) wild birds, some of which (11) to breeding grounds in Siberia. These birds could come (12) contact with others flying to Europe and North America.
Russia’s (13) began in the Novosibirsk (14) , about 1,750 miles (15) of Moscow in the Asian part of Russia, early last month, but the veterinary service (16) the virus only last week. Valery Mikheyev, the chief sanitary doctor of Novosibirsk, said that teams had been (17) the (18) birds and supervising the slaughter in13 (19) villages. He said, "The state of (20) of the inhabitants of these areas gives (21) cause for alarm. Up to 6,000 people are being (22) per day.
The virus seems to have (23) only private farms that let (24) mix with wild birds. Further outbreaks were registered in the Omsk and Altai regions, but the strain had (25) to be determined, Russia’s Emergency Situations Ministry said.
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