Questions 16-20
At first glance, why anyone would want to save California condors is not entirely clear. Unlike the closely related Andean condors with their white neck fluff or king vultures with their brilliant black-and-white colour, California condors are not much to see. Their dull black colour-even when contrasted with white underwings-featherless head and neck, oversized feet and blunt talons are hardly signs of beauty or strength. Their appeal begins to become evident when they take flights. California condors can soar almost effortlessly for hours, often covering hundreds of miles a day-far more than other creatures of the air. Only occasionally do they need to flap their wings-to take off, change direction or find a band of warm air known as thermal to carry them higher.
When it was discovered that the condor population was becoming dangerously small, scientists and zookeepers sought to increase condor numbers quickly to preserve as much of the species' genetic diversity as possible. From studying wild condors, they already knew that if a pair lost an egg, the birds would often produce another. So the first and sometimes second eggs laid by each female in captivity were removed, artificially incubated, and the chicks raised using hand-held puppets made to look like adult condors. Such techniques quickly proved effective.
Despite these successes, the effort to save California condors continues to have problems, evoke criticisms and generate controversy. Captive-hatched condors released to the wild have died at what to some people are alarmingly high rates. Others have had to be recaptured after they acted foolishly or became ill. As a result, the scientists, zookeepers and conservationists who are concerned about condors have bickered among themselves over the best ways to rear and release the birds.
Some of the odd behavior on the part of these re-released birds is hard to explain. At times they landed on people's houses and garages, walked across roads and airport runways, sauntered into park visitor centers and fast food restaurants, and took food offered by picnickers and fishermen. None are known to have died by doing so, though. Most recently, some of the first chicks hatched in the wild died after their parents fed them bottle caps, glass shards, pieces of plastic and other man-made objects that fatally perforated or blocked their intestines. These deaths may be due to the chicks' parents mistaking man-made objects for bone chips eaten for their calcium content.
Mike Wallace, a wildlife specialist at the San Diego Zoo, has suggested that some of the condors' problems represent natural behavior that helps them survive as carrion eaters. The real key to successful condor reintroduction, he believes, lies in properly socializing young condors as members of a group that follow and learn from older, preferably adult birds. That, he argues, was missing from earlier condor releases to the wild. Typically, condors hatched in the spring were released to the wild that autumn or winter, when they were still less than a year old. Now, condor chicks at several zoos are raised in cave-like nest boxes. The chicks can see older condors in a large flight pen outside their box but cannot interact with them until they are about five months old. Then the chicks are gradually released into the pen and the company of the social group. The group includes adult and older juvenile condors that act as mentors for younger ones.
16.
According to the passage, the most impressive feature of the California condor is _______.
(A) its resemblance to Andean condor
(B) its ability to glide
(C) its colorful plumage
(D) its blunt talons
17.
In the first stage of the conservation program _______.
(A) eggs were removed from the nests of wild condors
(B) female condors were captured and studied carefully
(C) scientists and zookeepers tried to create genetic diversity
(D) condors were induced to lay more than one egg
18.
Which of the following is true about the attempts to save these birds from extinction?
(A) There is disagreement about the methods employed.
(B) The majority of condors released into the wild became ill.
(C) Attempts to breed condors in captivity have failed,
(D) Condors reintroduced into the wild are unable to hunt.
19.
Some chicks hatched by re-released condors died because _______.
(A) they fell into pools of water
(B) they fell prey to other animals
(C) they had odd drinking habits
(D) they swallowed dangerous objects
20.
According to Mike Wallace, there will be fewer problems _______.
(A) if young condors are taught not to eat so much carrion
(B) if the chicks are kept in cave-like nest boxes for five months
(C) if young condors can learn appropriate behavior from older birds
(D) if the chicks can have older birds for company when they hatch
一级建造师二级建造师二级建造师造价工程师土建职称公路检测工程师建筑八大员注册建筑师二级造价师监理工程师咨询工程师房地产估价师 城乡规划师结构工程师岩土工程师安全工程师设备监理师环境影响评价土地登记代理公路造价师公路监理师化工工程师暖通工程师给排水工程师计量工程师
执业药师执业医师卫生资格考试卫生高级职称执业护士初级护师主管护师住院医师临床执业医师临床助理医师中医执业医师中医助理医师中西医医师中西医助理口腔执业医师口腔助理医师公共卫生医师公卫助理医师实践技能内科主治医师外科主治医师中医内科主治儿科主治医师妇产科医师西药士/师中药士/师临床检验技师临床医学理论中医理论