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Biologically, there is only one quality which distinguishes us from animals: the ability to laugh...

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Not do only    Do not only    Only not do    Not only do  
Only if I will    Only that I may    Only when I want    Only if I may  
slightly acidic  slightly alkaline  no salty  slightly bitter  
If only the police arrived    Not only the police arrived    Only if the police arrived    Not only did the police arrive  
Only then   It was only then   Only after   It was only after  
Not only  If only  Only  Not only was  
A. Only in very special cases In very special cases only Only very in special cases In only very special eases  
changed the pilots biologically to win the war.  develop genetic farming for food supply.  kill the people he thought of as inferior.  encourage the development of genetic weapons for the war.  
Body fluid from test animals may contain such biologically active metabolites.  A positive control group, i.e a group of animals in which the effect of a drug known to be positive is examined.  Disease models can be made by treating animals with certain chemicals or other modalities.  For study of those herbal medicines, animal models may need to be established according to those principles.  An examination Of literature may help to select the species and test systems.  找出相应的英文  
Body fluid from test animals may contain such biologically active metabolites.  A positive control group, i.e a group of animals in which the effect of a drug known to be positive is examined.  Disease models can be made by treating animals with certain chemicals or other modalities.  For study of those herbal medicines, animal models may need to be established according to those principles.  An examination Of literature may help to select the species and test systems.  找出相应的英文  
Body fluid from test animals may contain such biologically active metabolites.  A positive control group, i.e a group of animals in which the effect of a drug known to be positive is examined.  Disease models can be made by treating animals with certain chemicals or other modalities.  For study of those herbal medicines, animal models may need to be established according to those principles.  An examination Of literature may help to select the species and test systems.  找出相应的英文  
only being told    only to be told    only to tell    only having told  
Not only for pleasure is it    Not only it is for pleasure    Not only is it for pleasure    It is not only for pleasure  
Body fluid from test animals may contain such biologically active metabolites.  A positive control group, i.e a group of animals in which the effect of a drug known to be positive is examined.  Disease models can be made by treating animals with certain chemicals or other modalities.  For study of those herbal medicines, animal models may need to be established according to those principles.  An examination Of literature may help to select the species and test systems.  找出相应的英文  
only finding    only to find    to find only    finding only  
only finding    only find    only to find    find only  
Solving the mystery of sleeping and waking requires new insights.  Most of the other things people do regularly are biologically straightforward.  The problem sounds rather grand.  We still lack for progress though we' ve spent much more time studying it.