问题 单项选择题

急性牙髓炎的病理表现为( )

A.毛细血管增生,肉芽组织形成

B.有坏死组织覆盖,可见钙化物沉积

C.牙髓组织中出现大小不等的泡状间隙

D.血管扩张充血,通透性增加,液体成分渗出,组织水肿

E.牙髓组织过度增生

答案

参考答案:D

解析: 其病理表现为具有浆液性炎症特征,可见血管扩张充血,通透性增加,液体成分渗出,组织水肿。

阅读理解

Can we give a hand to those endangered animals? Yes, we may only do a little bit, but together our small actions add up to a lot.

1. Protect wildlife habitat.

Perhaps the greatest threat that faces many species is the widespread destruction of habitat. Cutting down forests, farming, and development all result in loss of wildlife habitat. In areas where rare species live, habitat destruction can quickly force a species to extinction. By protecting habitat, entire communities of animals can be protected together naturally. Parks and reserves are now all too often the only habitats that are left untouched by habitat destruction.

2. Reduce the threat of invasive (入侵的) species.

The spread of non-native species has greatly reduced native populations around the world. Invasive species compete with native species for resources (资源) and habitat. They can even prey on native species directly, forcing native species towards extinction.

3. Place decals (贴花纸) on windows.

It is reported that as many as one billion birds in the United States die each year because of collisions (碰撞) with windows. You can help reduce the number of collisions simply by placing decals on the windows in your home and office.

4. Slow down when driving.

Many native animals have to live in developed areas and this means they must move in human-living areas. One of the biggest obstacles (障碍) to them is that created by roads. Roads divide habitat and present a constant risk to any animal attempting to cross from one side to the other. So when you’re out and about, slow down and keep an eye out for wildlife.

小题1: What would be the best title for this passage?

A.How animals go to extinction

B.The importance of protecting wildlife

C.What to do to help save wildlife

D.How to protect wildlife habitat小题2:By writing the underlined sentence, the writer means that _____.

A.more parks and reserves should be built

B.we should have more habitats free of destruction

C.there is a need for improvement in parks and re-serves

D.parks and reserves are good examples of protecting wildlife小题3:People are advised to put decals on windows to _____.

A.decorate the houses and beautify the environment

B.protect the windows from birds hitting

C.attract more birds to make homes nearby

D.avoid birds hitting the windows by mistake小题4:The underlined phrase “prey on” in the passage means _____.

A.drive away

B.live with

C.kill for food

D.fight with

单项选择题