在原发性病原微生物感染后，经过若干时间又并发它种病原菌的感染，称为（） A.单一感染

高钾血症时心电图的改变有（）

A.P-R间期延长

B.QRS波幅增宽

C.T波高尖

D.U波

E.Q-T间期延长

For 40 years, the people of London have been happy to discover in their parks a bird that seems to have made its way from the Himalayas to the capital of England. With its shocking green body, red mouth, long tail and noisy screech(尖叫), the rose-ringed parakeet (长尾小鹦鹉) brought a vivid colour to parks in and around London.

However, the parakeets are no longer welcome. The government has suddenly woken up to the fact that there are many more parakeets in and around London making life harder for the local bird population. Government experts put the number of parakeets at around 30,000. They fear that if the number of parakeets keeps rising, these birds will push out local birds like wood-peckers, starlings and nuthatches from trees to build their own nests.

Not only that. According to an online report by The Independent, the parakeets will then also get control of most of the food available in the parks — seeds, berries, fruit and nuts. The local bird population will then have a hard time staying alive. An organization called the Royal Society for the Protection of Birds (RSPB) has asked the government to investigate (调查) what kind of a threat the parakeet brings to local birds. If the government decides that these birds are indeed a threat to local birds, steps will be taken to control the number of parakeets.

The most surprising thing about the case of the rose-ringed parakeet is that no one quite knows how the parakeets came from India and started breeding (繁殖) in areas around London.

小题1:Parakeets are no longer welcome mainly because ______.

A．the local birds are being driven out

B．the government doesn’t like the birds

C．they are a threat to people’s health

D．people have a great fear of this kind of birds小题2:According to an online report by The Independent, ______.

A．the parakeets’ future threat is impossible

B．the number of the parakeets is around 3,000

C．the parakeets should fly back to the Himalayas

D．the local birds won’t have enough food小题3:People are not certain ______.

A．where the parakeets live

B．how the parakeets breed

C．how they flew to London

D．when they started living in London小题4:The best title for this passage would be _____.

A．Help the parakeets

B．Pretty birds have trouble

C．Birds invade London

D．Pretty birds

坐武广高速从长沙出发到广州要多长时间？

电梯构造由几部分组成？

简述扦样程序。