问题 选择题

构成人体的四种基本组织是(  )

①保护组织②上皮组织③机械组织④肌肉组织⑤神经组织⑥营养组织⑦结缔组织⑧输导组织.

A.②⑤⑥⑦

B.②④⑤⑦

C.①③④⑧

D.⑤⑥⑦⑧

答案

人体的基本组织有:上皮组织、肌肉组织、神经组织、结缔组织等,神经组织主要有神经细胞构成,能接受刺激,产生和传导兴奋.结缔组织的种类很多,骨组织、血液等都属于结缔组织,具有营养、支持、连接、保护等作用.肌肉组织主要由肌细胞构成,具有收缩、舒张功能.如心肌、平滑肌等.上皮组织由上皮细胞构成,具有保护、分泌等功能.如皮肤的上皮,小肠腺上皮,消化道壁的内表面等.

故选B

单项选择题
单项选择题

Most towns up to Elizabethan times were smaller than a modern village and each of them was built around its weekly market where local produce was brought for sale and the town folks sold their work to the people from the countryside and provided them with refreshment for the day. Trade was virtually confined to that one day even in a town of a thousand or so people. On market days craftsmen put up their stalls in the open air whilst on one or two other days during the week the townsman would pack up his loaves, or nails, or cloth, and set out early to do a day’s trade in the market of an adjoining town where, however, he would be charged a heavy toll for the privilege and get a less favourable spot for his stand than the local craftsmen. Another chance for him to make a sale was to the congregation gathered for Sunday morning worship. Although no trade was allowed anywhere during the hours of the service (except at annual fair times), after church there would be some trade at the church door with departing country folk.

The trade of markets was almost wholly concerned with exchanging the products of the nearby countryside and the goods sold in the market but particularly in food retail dealing was distrusted as a kind of profiteering. Even when there was enough trade being done to afford a livelihood to an enterprising man ready to buy wholesale and sell retail, town authorities were reluctant to allow it.

Yet there were plainly people who were tempted to “forestall the market” by buying goods outside it, and to “regrate” them, that is to resell them, at a higher price. The constantly repeated rules against these practices and the endlessly recurring prosecutions mentioned in the records of all the larger towns prove that some well-informed and sharp-witted people did these things.

Every town made its own laws and if it was big enough to have craft guilds, these associations would regulate the business of their members and tried to enforce a strict monopoly of their own trades. Yet while the guild leaders, as craftsmen, followed fiercely protectionist policies, at the same time, as leading townsmen, they wanted to see a big, busy market yielding a handsome revenue in various dues and tolls. Conflicts of interest led to endless, minute regulations, changeable, often inconsistent, frequently absurd. There was a time in the fourteenth century, for example, when London fishmongers were not allowed to handle any fish that had not already been exposed for sale for three days by the men who caught it.

Craftsmen might prefer to trade in their own town because()

A. there they could easily find good refreshment

B. there they could work in the open air

C. there they could start work very early

D. there they could have the well-placed stalls