5×4读作（ ）乘（ ），表示（ ）个（ ）相加。

旅游合同中，价款或者报酬不明确的，应按照( )的市场价格履行。

A．订立合同时履行地
B．履行合同时履行地
C．订立合同时合同签订地
D．履行合同时合同签订地

已知偶函数y=f（x）满足：当x≥2时，f（x）=（x-2）（a-x），a∈R，当x∈[0，2）时，f（x）=x（2-x）

（1）求当x≤-2时，f（x）的表达式；

（2）试讨论：当实数a、m满足什么条件时，函数g（x）=f（x）-m有4个零点，且这4个零点从小到大依次构成等差数列．

患者女，69岁。30年前无诱因出现右髋部疼痛，呈钝痛，偶尔放射至右膝关节，长距离行走及天气变化时疼痛明显，休息后缓解。15年前，右髋部疼痛程度加重，持续时间延长，逐渐出现跛行。3年前，右髋部疼痛进一步加剧，疼痛持续存在，不能上、下楼梯，平地全程扶柺行走。

对诊断有帮助的实验室检查应首先考虑（提示查体：跛行步态，右下肢短缩1.5cm，右髋关节屈曲、内收、外展、内旋和外旋活动明显受限。）（）

A.髋关节超声

B.MRI

C.PET-CT

D.关节穿刺，关节液涂片

E.X线摄片

男性，35岁，双手腕指关节疼痛10年，10年前开始双手腕指关节早起时出现僵硬、不灵活感，以后出现疼痛，常服吲哚美辛、阿司匹林止痛，近1年止痛效果渐差，并出现腕关节及指关节肿胀变形。

该患者的诊断首先考虑的是（）。

A.痛风

B.类风湿关节炎

C.骨性关节炎

D.风湿性关节炎

E.反应性关节炎

How could we possibly think that keeping animals in cages in unnatural environments－mostly for entertainment purposes－is fair and respectful?

Zoo officials say they are concerned about animals. How ever, most zoos remain “collections” of interesting “things” rather than protective habitats (栖息地). Zoos teach people that it is acceptable to keep animals bored, lonely, and far from their natural bones.

Zoos claim (声称) to educate people and save endangered species(物种), but visitors leave zoos without having learned anything meaningful about the animals’ natural behavior, intelligence, or beauty. Zoos keep animals in small spaces or cages, and most signs only mention the species’ name, diet, and natural range(分布区). The animals’ normal behavior is seldom noticed because zoos don’t usually take care of the animals’ natural needs.

The animals are kept together in small spaces, with no privacy and little opportunity for mental and physical exercise. This results in unusual and self-destructive behavior called zoochosis. A worldwide study of zoos found that zoochosis is common among animals kept in small spaces or cages. Another study showed that elephants spend 22 percent of their time making repeated head movements or biting cage bars, and bears spend 30 percent of their time walking back and forth, a sign of unhappiness and pain.

Furthermore, most animals in zoos are not endangered. Captive breeding (圈养繁殖) of endangered big cats, Asian elephants, and other species has not resulted n their being sent back to the wild. Zoos talk a lot about their captive breeding programs because they do not want people to worry about a species dying out. In fact, baby animals also attract a lot of paying customers. Haven’t we seen enough competitions to name baby animals?

Actually, we will save endangered species only if we save their habitats and put an end to the reasons people kill them. Instead of supporting zoos, we should support groups that work to protect animals’ natural habitats.

64. How would the author describe the animals’ life in zoos?

A. Dangerous.        B. Unhappy.          C. Natural.            D. Easy.

65. In the state of zoochosis, animals _________.

A. remain in cages                       B. behave strangely

C. attack other animals                 D. enjoy moving around

66. What does the author try to argue n the passage?

A. Zoos are not worth the public support.

B. Zoos fail in their attempt to save animals.

C. Zoos should treat animals as human beings.

D. Zoos use animals as a means of entertainment.

67. The author tries to persuade readers to accept his argument mainly by _____.

A. pointing out the faults in what zoos do

B. using evidence he has collected at zoos

C. questioning the way animals are protected

D. discussing the advantages of natural habitats

68. Although he argues against zoos, the author would still agree that _______.

A. zoos have to keep animals in small cages

B. most animals in zoos are endangered species

C. some endangered animals are reproduced in zoos

D. it’s acceptable to keep animals away from their habitats