题目内容：

 

In the last seven days I have seen the pressure that the NHS is under. I have seen the personal courage not just of the doctors and nurses but of everyone, the cleaners, the  1.(cook), the health care workers of every description-physios, radiographers 2.have kept coming to work, kept putting themselves in harm's way, kept 3.(risk) this deadly virus. It is thanks to that courage, that devotion, that duty and that love that our NHS has been unbeatable.

The Arctic Ocean in summer will very likely be ice free before 2050, at least temporally. The research team 4.  (analyze) recent results from 40 different climate models. Using these models, the researchers considered the future evolution of Arctic sea ice cover in a scenario with high future CO2 emissions and little climate protection. As 5.(expect), Arctic sea ice disappeared quickly in summer in these simulations.

However, the new study finds that Arctic summer sea ice also disappears occasionally if CO2 emissions are  6.(rapid) reduced.

In order to understand7. bird brains changed, a team of 37 scientists used CT scan data to create endocasts(内腔)of hundreds of birds and dinosaurs, which the8.(combine)with a large existing database of brain measurements from modern birds.

They then analyzed brain-body allometry (体形变). “There is no clear line 9.the brains of advanced dinosaurs and primitive birds,”10.(note) co-author Dr. Amy Balanoff of Johns Hopkins University." Birds like pigeons have the same brains sizes you would expect for a dinosaur of the same body size, and in fact some species like moa(恐鸟) have smaller-than-expected brains.”