Sleep can cure colds.A．RightB．WrongC．Not mentione

Oral problems can not be avoided in any way.A．RightB．WrongC．Not mentioned

All the aquatic mammals sleep a lot.A．RightB．WrongC．Not mentioned

With the evolution, human beings may sleep more.A．RightB．WrongC．Not mentioned

Cats and dogs often have dreamless sleep.A．RightB．WrongC．Not mentioned

A. RightB. WrongC. Not mentioned

Colds can be avoided.A．RightB．WrongC．Not mentione