2.The koala is one of Australia's most treasured creatures,which is a lovely little creature.But now,it is in big trouble.
Affected by habitat (棲居地) loss and climate change,like many other uniquely Australian animals,koalas are being squeezed into smaller regions.But at present,it is a deadly disease,a somewhat silent killer that causes a further decline in the koala population,that is worrying many scientists about the fate of the koala.
The killer is Chlamydia,which has caused symptoms in up to 50percent of the wild koalas,with probably even more infected (感染) but not showing symptoms.It has been particularly severe in Queensland,where nearly all koalas are infected.The disease causes many symptoms including eye infections,which can lead to blindness,making it difficult for them to find their primary food.
Treating Chlamydia in wild koalas is a challenge.There is no treatment available for it.Only a small percentage of the animals can be treated successfully and returned to the wild.Besides,there is no national plan in Australia to save the koala;it is up to each region to make management plans for its koala population.
The good news is that researchers are working to test a vaccine (疫苗) that would help prevent further spread.If all goes well,plans can be carried out to distribute the vaccil1e more widely.But it's impossible to vaccinate all wild koalas.
Another possibility would be to make vaccine distribution a routi11e part of treatment for the thousands of koalas brought into care centers every year after they are injured by cars or dogs.
While it is a combination of problems that are affecting the wild koala population,many experts believe this vaccine would be an important step in helping koalas survive longer.It may buy enough time to give researchers a chance to solve some of the other problems facing Australia's koalas.
71.Which isn't considered the main cause of koala's population decline?B
A.Habitat loss.
B.Injuries from cars and dogs.
C.Climate change.
D.A deadly disease.
72.The third paragraph mainly tells usA.
A.the serious result Chlamydia has caused to the koala
B.Chlamydia affected the koala only in particular regions
C.the most serious symptom of Chlamydia is eye infections
D.Chla1nydia can seriously affect koala's primary food
73.The underlined word"it"in the fourth paragraph probably refers toB.
A.the koala B.Chlamydia C.national plan D.eye infection
74.We can learn from the text that the vaccineD.
A.would cure the killer Chlamydia quite effectively
B.would only be distributed in koala care centers
C.has already been put into practical use in Australia
D.cannot be distributed to all the infected koalas
75.It can be inferred from the text thatC.
A.a(chǎn) national plan for saving koalas will be made soon in Australia
B.koala population is declining only in a few regions
C.researchers need enough time to so1ve the koala problems
D.experts have lost the best chance to save the infected koalas.
分析 文章講述的是考拉所面臨的嚴(yán)重問題,棲息地和氣候變化,尤其是一種特殊的疾病對(duì)考拉的影響.
解答 71.B 細(xì)節(jié)理解題.根據(jù)第二段Affected by habitat (棲居地) loss and climate change,以及第三段The killer is Chlamydia可知ACD是主要原因,而B"汽車和狗的傷害"則不是.故選B.
72.A 段落大意題.這一段講述的是衣原體對(duì)考拉造成的嚴(yán)重后果.故選A
73.B 詞義猜測題.根據(jù)第三段的句子Treating Chlamydia in wild koalasis a challenge可知,治療野生的考拉的衣原體是有挑戰(zhàn)的,后面說沒有它的療法,it 指的是Chlamydia,故選B.
74.D 細(xì)節(jié)理解題.根據(jù)倒數(shù)第三段最后一句But it's impossible to vaccinate (給注射疫苗) all wild koalas.可知疫苗分配給所有被感染的考拉是不可能的,故選D.
75.C 推理判斷題.根據(jù)文章最后一句It may be enough time to giveresearchers a chance to solve some of the other problems facing Austalia'skoalas.可知研究人員需要足夠的時(shí)間,解決考拉的問題,故選C.
點(diǎn)評(píng) 本文是科教類閱讀,主要考查細(xì)節(jié)理解題和推理判斷題.在做細(xì)節(jié)理解題時(shí),首先根據(jù)題目要求迅速在文章里找出相應(yīng)的段落、句子或短語.認(rèn)真比較選項(xiàng)和文中細(xì)節(jié)的區(qū)別,在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.