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---Can I take a look at the menu for a few more minutes before I order.---Of course.（）,sir.
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大气压为100 kPa，某往复压缩机入口处压强表读数为50kPa，出口处压强表读数为550 kPa，则往复压缩机出入口的绝对压强差为（）
漏洞分析的目的是发现目标系统中存在的安全隐患，分析所使用的安全机制是否能够保证系统的机密性、完整性和（）
(B)Londoners are great readers.They buy large numbers of newspapers and magazines and of books---especially paperbacks,which are comparatively cheap in spite of ever increasing rises in the cost of printing.They still continue to buy“proper”books,too,printed on good paper and bound between hard covers.There are many streets in London containing shops which specialize in book selling.Perhaps the best known of these is Charring Cross Road in the very heart of London.Here books of all kinds and sizes are to be found,from“the biggest bookshop in the world”to“the tiny,dusty little places which seem to have been left over from Dickens’time.Some of the shops stock or will obtain any kind of books,but many of them specialize in second-hand books,in art books,in foreign books,in books on philosophy,politics or any other various subjects about which books may be written.Although it may be the most convenient place for Londoners to buy books,Charring Cross Road is not the cheapest.For the really cheap second-hand volumes,the collector must turn to Farringdon Road,for example,in the East Central District of London.Here there is nothing as great as bookshops.Instead,the booksellers come along each morning and tip out their sacks of books on to small barrows(流动售货车).And the collectors,some professional,and some just like it,who have been waiting for them,rushed to those dusty places.In places like this one can still,occasionally,pick up for a few pence an old volume that may be worth many pounds. The best title for this passage is（）.
(A)Many of us don’t pay much attention to the importance of eye care.It is said that if you take care of your body,then you can surely be healthy.That is why our eyes should be given a lot of care.Natural eye care should be put in a number one place.There are several causes leading to poor eyesight like not enough food,genes and aging.Televisions,computers and reading are also the causes of having poor eyesight.If you happen to work in front of the computer,it is best to take a break every once in a while.Something dirty can cause redness and they will make you feel uncomfortable.It is bad for your eyes,too.If this happens,the best way is to clean your eyes by using cold water.You must also try your best to protect your eyes from harmful things.For example,sunglasses are not just for fashion but they can also serve as a great way to protect your eyesight from UV rays.Eating healthy foods will do good to your eyesight.Remember that vitamins A,C and E are good for eyes.Try to eat food groups that have these vitamins.And you should do eye exercises because exercise protects your eyesight,too.If a person exercises regularly and eats the right kind of food,his eyes will stay in good condition for a long time.All above are natural ways of eye care that help us keep healthy eyes.Being happy all the time can be helpful to a person’s eyesight,too.In a word,eye care is very important,no matter how old a person is. （）is the most important way to protect our eyes.
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