__________(28)
A.extremes
B.poles
C.tops
D.heights

__________(30)
A.dunes
B.piles
C.valleys
D.stores

__________(31)
A.inconsistent
B.incapable
C.inexperienced
D.independent

__________(33)
A.danger
B.dangerous
C.endanger
D.endangered

__________(35)
A.sight
B.lies
C.sites
D.seats

The author refers to the ocean bottom as a “frontier” in line 2 because it
A.is not a popular area for scientific research
B.contains a wide variety of life forms
C.attracts courageous explorers
D.is an unknown territory

The word “inaccessible” in line 3 is closest in meaning to
A.unrecognizable
B.unreachable
C.unusable
D.unsafe

Which of the following is true of the Glomar Challenger?
A.It is a type of submarine.
B.It is an ongoing project.
C.It has gone on over 100 voyages
D.It made its first DSDP voyage in 1968

The deep Sea Drilling Project was significant because it was
A.an attempt to find new sources of oil and gas
B.the first extensive exploration of the ocean bottom
C.composed of geologists form all over the world
D.funded entirely by the gas and oil industry

Chọn từ hoặc cụm từ thích hợp (ứng với A hoặc B, C, D) để hoàn thành mỗi câu sau.
The smell of the kippers cooking _______ my breakfast.
A.put me off
B.came up against
C.gave off
D.held up