以下有关肠梗阻时腹胀的描述哪项是不正确的A．高位肠梗阻腹胀可不明显 B．低位性小肠梗

在等比数列{a_n}中，a₁·a₂·a₃＝27，a₂＋a₄＝30，则公比q是(　　)

A．±3

B．±2

C．3

D．2

阅读短文，把题后A—E五个句子填入空缺处，使短文内容完整.

There are many animals in the world. Some are dangerous, but some are not. Some live in the forest(森林).    小题1:    We can often see tigers, elephants. Monkeys, bears, snakes and many other animals in the zoos. Among them pandas only live in China.

Pandas are lovely animals. Most of them live in the deep forests of Sichuan Province in China.    小题2:  Their shoulders, legs , ears and eyes are black. Pandas are usually very heavy.    小题3:  However, pandas are very agile(敏捷的). They can climb trees as easily as some other animals do.

Pandas live mainly on bamboo leaves. They have big and sharp teeth . Every day each grown-up panda eats about 15-30 kilos of bamboo leaves.  小题4:     

Pandas also have spare time hobbies. Two of their hobbies are climbing trees and sleeping.

Sadly, there are not many pandas left in the world. 小题5:   This is why the Chinese government is doing its best to protect pandas against being hurt and killed.

A．Their fur is white .

B．Some live in the zoos.

C．And they usually spend 10-20 hours eating.

D．That’s because some bad hunters are trying to kill them for money.E. Some of them can be about 1.5 meters tall and weigh about 100 kilos.

科学的研究方法是取得成功的关键。下列关于人类探索遗传奥秘历程中的科学实验方法及技术的叙述，不正确的是[ ]

A．孟德尔在研究豌豆杂交实验时，运用了假说——演绎法

B．萨顿根据基因和染色体的行为存在平行关系，类比推理出基因位于染色体上

C．格里菲思利用肺炎双球菌研究遗传物质时，运用了放射性同位素标记法

D．沃森和克里克研究DNA分子结构时，运用了建构物理模型的方法

Increasingly, the development of tourism is seen to have an effect on the environment. Erosion (磨损) is one problem. The steps and stones of major popular (51) like Shakespeare’s birthplace or Stonehenge (巨石阵) are literally being worn away by millions of foreign feet. The (52) in the case of Britain’s best known prehistoric monument has been to use railings to keep visitors at a distance. Such measures can hardly be (53) in the house of the Bard, however, where tourists want to enter the actual building.

Overcrowding in cities, towns and villages is (54) problem. Traffic jams are an outcome. In narrow roads, tourist vehicles cause congestion. (55) traders and residents cannot get around to do their work. Car parks fill up, (56) strangers park their cars where they can: in streets, across gateways, in lay-bys, or even in (57) driveways. This causes obstruction. The sheer weights of in-comers can be a hazard. Thus Venice, a city built for half a million inhabitants, is (58) by another half million who populate the city daily in the tourist (59) —eight million visits each year. The mayor recently decided to (60) visitors to 90,000 a day. the only way to save the city from overcrowding.

58().

A.destroyed 

B.paralyzed 

C.swollen 

D.ruined

根据我国《合同法》的规定，表见代理应具备的构成要件不包括（）。

A.所谓代理人并没有代理权

B.法定代表人、负责人超越权限

C.相对人主观上是善意的

D.客观上存在着使相对人有理由相信行为人有代理权的事实