it/ do/ him/ let/ alone.
A.Let him do alone it.
B.Let do him it alone.
C.Let it alone do him.
D.Let him do it alone.

What is the main topic of the passage?
A.Brain – human’s most complex part of the body.
B.Brain’s main function.
C.An overview of the most complex part of the body – Brain.
D.The brain’s complex operation.

The word “linked” in the 2nd paragraph could be best replaced by:
A.chained
B.connected
C.bundled
D.interfered

The word “This” in the 3rd paragraph refers to:
A.the brain
B.the action of the brain
C.response
D.hormones an neurotransmitters

Which of the following is impossible without the brain?
A.extracting information from the environment and acting in response to it
B.generating reflex responses as well as simple motor patterns such as swimming or walking
C.control behavior on the basis of complex sensory input which requires the information-integrating capabilities
D.coordinated body contractions and even locomotion

Don’t worry! He’ll do the job as ___________ as possible.
A.economical
B.economically
C.uneconomically
D.beautifully

The school boy __________down to tie his shoestring.
A.stopped
B.leaned
C.turned
D.went

He said he would contribute money, but later he __________ of it.
A.backed down
B.backed out
C.turned away
D.backed away

Poverty has reached _________ proportions in this country.
A.incubate
B.epidemic
C.infectious
D.transmit

What was Nobel's invention about?
A.It was about dynamite
B.It was about chemistry
C.It was about energy
D.It was about physics