题目内容
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Ocean exploration is not so expensive as space travel mainly because ______.
A．it is not affected Earth's gravity
B．most undersea vehicles operate at the end of long ropes
C．ROVs have been put to use
D．there is no need for submersibles to get away from Earth' s gravity
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更多“Ocean exploration is not so ex…”相关的问题
Why is ocean exploration not so expensive as space travel？
Because ______ for submersibles to get away from the Earth's gravity.
A．The ocean is frienghtening.
B．Underwater exploration is so much cheaper than space flight.
C．He wants to make more money.
D．The space is more philosophical.
Ocean exploration is not so expensive as space travel mainly because ______.
A．most undersea vehicles operate at tile end of long ropes
B．ROVs have been put to use
C．it is not affected by Earth's gravity
D．there is no need for submersibles to get away from Earth's gravity
A．the communication problem
B．the movement of waves
C．the ocean depths
D．the problem of vacuum
The author mentions outer space in the first paragraph because ______.
A．the Earth's climate millions of years ago was similar to conditions in outer space
B．it is similar to the ocean floor in being alien to the human environment
C．rock formations in outer space are similar to those found on the ocean floor
D．techniques used by scientists to explore outer space were similar to those used in ocean exploration
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 from all over the world
D．funded entirely by the gas and oil industry
The author mentions outer space in the first paragraph because______.
A．the Earth's climate millions of years ago was similar to conditions in outer space
B．it is similar to the ocean floor in being alien to the human environment
C．rock formations in outer space are similar to those found on the ocean floor
D．techniques used by scientists to explore outer space were similar to those used in ocean exploration
The author mentions "outer space" underlined in Paragraph 1 because ______.
A．the Earth's climate millions of years ago was similar to conditions in outer space
B．it is similar to the ocean floor in being alien to the human environment
C．rock formations in outer space are similar to those found on the ocean floor
D．techniques used by scientists to explore outer space were similar to those used in ocean exploration
The Deep Sea Drilling Project was of great significance because it was______.
A．the first attempt to use a special technique.
B．the first extensive exploration of the ocean bottom.
C．attracting many geologists from all over the world.
D．of great importance to funds of the gas and oil industry.
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