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

The word “felt” in line 3 is closest in meaning to
A.based
B.dropped
C.detected
D.explored

It can be inferred from the passage that the most important factor in determining how much gravitational effect one object in space has on the tides is
A.size
B.distance
C.temperature
D.density

The word “correspondingly” in line 11 is closest in meaning to
A.unpredictably
B.interestingly
C.similarly
D.unusually

The word “configuration” in line 18 is closest in meaning to
A.unit
B.center
C.surface
D.arrangement

According to the passage, all of the following statements about tides are true EXCEPT:
A.The time of high tide is later each day.
B.Tides have a greater effect on the sea than waves do.
C.The strongest tides occur at the quarters of the Moon.
D.Neap tides are more moderate than spring tides.