问题 填空题

如图是某同学在显微镜下观察人血涂片的一个视野图,据图作答:

(1)血细胞中数目最多的是图中的______

(2)体积最大,数目最少的是图中的______

(3)与止血有关的是图中的______

(4)我们吃入的营养主要由图中的______来运输它还运输我们体内产生的______气体.

答案

如图血液的组成包括血浆和血细胞,血细胞包括红细胞、白细胞和血小板.图中①个体最小,是血小板;②的数量最多,是红细胞;③的个体最大且有细胞核,是白细胞;剩下的④是血浆.

(1)血细胞中数目最多的是图中的②红细胞,血液的颜色之所以呈现红色是因为血液的红细胞中含有血红蛋白,血红蛋白是红色含铁的蛋白质;

(2)体积最大,数目最少的是图中的③白细胞,白细胞能够吞噬病菌,有防御疾病的作用,故人体被细菌感染出现炎症时,白细胞会增多;

(3)与止血有关的是图中的①血小板,血小板的功能是止血和加速凝血,若数目明显下降时,凝血功能障碍,会引起人体皮下出血;

(4)我们吃入的营养主要由图中的④血浆来运输,还运输我们体内产生的二氧化碳气体.血浆呈淡黄色,半透明,血浆中含有大量的水(约占91%--92%),还含有蛋白质、葡萄糖、无机盐等.可见血浆的主要是运载血细胞,运输养料和废物,红细胞具有运输氧的功能,此外,红细胞还运输一部分二氧化碳.

故答案为:(1)②;

(2)③;

(3)①;

(4)④;二氧化碳.

阅读理解

A month after Hurricane Katrina, I returned home in New Orleans. There lay my house, reduced towaist-high ruins, smelly and dirty.

Before the trip, I’d had my car fixed. When the office employee of the garage was writing up the bill,she noticed my Louisiana license plate. “You from New Orleans?”she asked I said I was, “No charge.”She said, and firmly shook her head when I reached for my wallet. The next day I went for a haircut, and the same thing happened.

As my wife was studying in Florida, we decided to move there and tried to find a rental house that we could afford while also paying off a mortgage (抵押贷款〉on our mined house. We looked at many places, but none was satisfactory. We’d began to accept that we*d have to live in extremely reduced circumstances for a while, when I got a very curious e-mail from a James Kemmedy in California. He’d read some pieces I’d written about our sufferings for State, the online magazine  and wanted to give us (""no conditions attached’)a new house across thelake from New Orleans.

It sounded too good to be true, but I replied, thanking him for his exceptional generosity, that we had no plan to go back. Then a poet at the University of Florida offered to let his house to me, while he went to England on his one-year paid leave. The rent was rather reasonable. I mentioned the poet’s offer to James Kemdedy, and the next day he sent a check covering our entire rent for eight months.

Throughout this painful experience, the kindness of strangers has done much to bring back my faith in humanity. It’s almost worth losing your worldly possessions to be reminded that people are really nice when given half a chance.

小题1:The garage employee’s attitude toward the author was that of          

A.unconcern

B.sympathy

C.doubt

D.tolerance小题2:What do we know about James Kemnedy?

A.He was a writer of an online magazine.

B.He was a poet at the University of Florida

C.He offered the author a new house free of charge.

D.He learned about the author’s sufferings via e-mail小题3:It can be inferred from the text that         

A.the author’s family was in financial difficulty

B.rents were comparatively reasonable despite the disaster

C.houses were difficult to find in the hurricane-stricken area

D.the mortgage on the ruined house was paid off by the bank小题4:The author learned from his experience that         

A.worldly possessions can be given up when necessary

B.generosity should be encouraged in some cases

C.people benefit from their sad stories

D.human beings are kind after all.

选择题