【解析】　推理判断题。第二段提到"Affected by habitat (栖居地) loss and climate change"以及后面提到的"deadly disease"可知选B。

　　【答案】　B

　　2．The third paragraph mainly tells us ．

　　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．Chlamydia can seriously affect koala's primary food

　　 【解析】　主旨大意题。根据第三段叙述可知主要叙述了这种疾病给考拉造成的后果。

　　【答案】　A

　　3．The underlined word "it" in the fourth paragraph probably refers to ．

　　A．the koala　　 B．Chlamydia

　　C．national plan D．eye infection

　　【解析】　词义猜测题。根据上一句的叙述可知是"Chlamydia"。

　　【答案】　B

　　4．We can learn from the text that the vaccine ．

　　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

　　【解析】　推理判断题。根据第五段最后一句"But it's impossible to vaccinate all wild koalas."可知D正确。

　　【答案】　D

　　B

Australians have been warned they face a life or death decision over their water­drink recycled sewage or die.