More has been learned since 1945 about the chemical changes in the body than in all human history before time.

A. got over

B. came through

C. went over

D. got through

A .course

B. causes

C. create

D. rise

A . would be

B. should be

C. was

D. were

A.to work

B.to be working

C.to have worked

D.to having been working

A. What

B. What a

C. How

D. How a

A.Were you to

B.Would you

C.Could you

D.Might you

A.be fed

B.feed

C.having fed

D.being fed

A.which

B.where

C.when

D.what

A.moment

B.a moment

C.the moment

D.that moment

A.Following

B.To follow

C.Follow

D.He followed