[填空题]It is already the (know) __________ fact that we are developing at a fast speed.

[填空题]Although we already know a great deal about influenza, it is difficult for epidemiologists (流行病学家), who study infectious disease, to (36) when and where the next flu epidemic will occur, and how (37) it will be. There are three kinds of influenza virus, known as A, B and C. Influenza C virus is relatively stable and causes mild (38) that do not spread far through the population. The A and B types are (39) , and are responsible for the epidemics that cause frequent concern. Following any virus attack, the human body builds up antibodies which confer (给予) immunity to that strain of virus, but a virus with the capacity to change its character is able to bypass this (40) . Variability is less developed in the influenza B virus, which affects only human beings. An influenza B virus may cause a widespread but will have little effect if (41) into the same community soon afterwards, since nearly everyone will have built up

[填空题]It is already the (know) ______ fact that we are developing at a fast speed.

[填空题]It is already the (know) __________ fact that we are developing at a fast speed.

[单项选择]From the conversation we know if we buy more products from the Universal Computers Ltd., ______.
A. we can earn more mone
B. we can benefit more
C. they will give us more service
D. they will move their main building to China

[简答题]We all know that we should take better care of ourselves, relax more, and have more fun at work (and elsewhere, as well) , but it’s easy to overlook the opportunities to do just that be cause of the daily work priorities that consume our lives. Here are some ideas for learning to take action in your work life.

[单项选择]Since it is already midnight, we（）now.
A. had better leaving
B. had better leave
C. had better to leave
D. had better have left