問題詳情
California condors are North America’s largest birds, with wind-length of up to 3 meters.In the 1980s, electrical lines an d lead poisoning nearly drove them to dying out. Now, electricshock training and medical treatment are helping to rescue these big birds.In the late 1980s, the last few condors were taken from the wild, and there are now more than150 flying over California and nearby Arizona, Utah and Baja in Mexico.Electrical lines have been killing them off. “As they go in to rest for the night, they just don’tsee the power lines,” says Bruce Rideout of San Diego Zoo. Their wings can bridge the gapbetween lines, resulting in electrocution if they touch two lines at once.So scientists have come up with a shocking idea. Tall poles, placed in large training areas,teach the birds to stay clear of electrical lines by giving them a painful but undeadly electricshock. Before the training was introduced, 66% of set-freed condors died of electrocution.This has now dropped to 18%.Lead poisonous has proved more difficult to deal with. When condors eat dead bodies ofother animals containing lead, they absorb large quantities of lead. This affects their nervoussystems and ability to produce baby birds, and can lead to kidney failures and death. Socondors with high levels of lead are sent to Los Angeles Zoo, where they are treated withcalcium EDTA, a chemical that removes lead from the blood over several days. This work isstarting to pay off. The annual death rate for adult condors has dropped from 38% in 2000 to5.4% in 2011.Rideout’s team thinks that the California condors’ average survival time in the wild isnow just under eight years. “Although these measures are not effective forever, they are vitalfor now,” he says. “They are truly good birds that are worth every effort we put into recoveringthem. ”
60.California condors attract researchers’ interest because they _________.
(A) are active at night
(B) had to be bred in the wild
(C) are found on in California
(D) almost died out in the 1980s
60.California condors attract researchers’ interest because they _________.
(A) are active at night
(B) had to be bred in the wild
(C) are found on in California
(D) almost died out in the 1980s
參考答案
答案:D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
內容推薦
- 【題組】(A) economically (B) traditionally (C) inadequately (D) occasionally
- III. DiscourseSometimes we decide that a little unnecessary danger is worth it because when we weigh
- 【題組】It can be inferred from the passage that Nigel Shadbolt doubts whether _______.(A) social me
- 【題組】The main purpose of the passage is to ______.(A) compare and evaluate (B) examine and assess
- 【題組】(A) honored (B) left (C) crowded (D) compared
- 【題組】(A) opinion (B) risk (C) performance (D) attractiveness
- Enough “meaningless drivel”. That’s the message from a group of members of the UKgovernment who have
- 【題組】(A) doubling (B) maintaining (C) reducing (D) estimating
- 【題組】(A) asking (B) training (C) warning (D) firing
- 【題組】(A) bossy (B) experienced (C) western (D) male
內容推薦
- 【題組】(A) deny (B) admit (C) assume (D) ensure
- 【題組】___________________
- 【題組】Researchers have found electrical lines are.(A) blocking condors’ journey home (B) big kille
- 【題組】The writer advises users of social media to _______.(A) think carefully before posting anyth
- 【題組】(A) virtual (B) ineffective (C) day-to-day (D) on-the-scene
- 【題組】____________________
- 【題組】According to Paragraph 5 ,lead poisoning.(A) makes condors too nervous to fly (B) has little
- 【題組】Which of the following is the best title of the passage?(A) Say no to social media?(B) New s
- 【題組】____________________
- 【題組】The passage shows that .(A) the average survival time of condors is satisfactory(B) Rideout’s
- 【題組】____________________
- 【題組】Which of the following is NOT true about the installment plan?(A) A lot of British families
- 一、分別利用 Mohr 法和 Volhard 滴定法分析乳油和乾酪中的食鹽含量,並比較兩種方法原理的異同點。(20 分)
- 【題組】___________________
- 【題組】Goods bought on installments are more expensive than goods bought by cash because________.(A
- What is the first thing you notice when you walk into a shop? The products displayedat the entrance?
- 【題組】______________________
- 【題組】The advantage of installment buying might include all the following EXCEPT that ________.(A)
- 【題組】E-shops are mentioned in the passage to ______.(A) show the advantages of bricks-and-mortar
- 一、詳述一般貨櫃船中間軸與艉軸之聯結器螺栓(coupling bolt)新製檢驗程序、項目及船上安裝檢驗。(20 分)
- 【題組】In some countries, the governments control the installment plan to ________.(A) increase emp
- 【題組】The underlined word “destination” in Paragraph 5 means ______.(A) a platform that exhibits g
- Doctors are often for being poor communicators, particularly when they have to give patients bad
- For about half century, scientists have been making better and better computers. Now acomputer can d
- The government demands a complete against drug trafficking.(A) nomination (B) prohibition (C) rev