Methods of observation such as EEG recording and functional brain imaging tell us:
A.how individual cells give rise to complex operations is unknown.
B.the works of brain are highly organized.
C.single unit recording can resolve the activity of single neurons.
D.nothing.

The passage can be described as:
A.informative
B.complicating
C.romantic
D.thrilling

Try to learn the meaning of new words ............heart.
A.in
B.on
C.at
D.by

The house is very dirty. We haven't cleaned it .........ages.
A.for
B.over
C.about
D.on

They are very proud ..........their new house.
A.of
B.in
C.to
D.for

It has rained ..........two o'clock.
A.for
B.about
C.since
D.during

__________(46)
A.harms
B.harmless
C.harmless
D.harm

__________(48)
A.fed with
B.feed on
C.fed up with
D.feed

__________(49)
A.flame
B.fires
C.blaze
D.burning

The enclosing card gives details about room rates and services.
A.enclosing
B.gives
C.about
D.services