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  3. Continued sedimentation—the process of deposits’ settling on the sea bottom— buries the organic matter and subjects it to higher

Continued sedimentation—the process of deposits’ settling on the sea bottom— buries the organic matter and subjects it to higher

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问题     Continued sedimentation—the process of deposits’ settling on the sea bottom— buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas.As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby.Over long periods of time(millions of years), accumulations of gas and oil can collect in the sandy layers.Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
Look at the four squares[]that indicate where the following sentence can be added to the passage.
Unless something acts to halt this migration, these natural resources will eventually reach the surface.
Where would the sentence best fit?
选项 A、Continued sedimentation—the process of deposits’ settling on the sea bottom—buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas. Unless something acts to halt this migration, these natural resources will eventually reach the surface. As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby.Over long periods of time(millions of years), accumulations of gas and oil can collect in the sandy layers.Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
B、Continued sedimentation—the process of deposits’ settling on the sea bottom—buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas.As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby. Unless something acts to halt this migration, these natural resources will eventually reach the surface. Over long periods of time(millions of years), accumulations of gas and oil can collect in the sandy layers.Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
C、Continued sedimentation—the process of deposits’ settling on the sea bottom—buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas.As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby.Over long periods of time(millions of years), accumulations of gas and oil can collect in the sandy layers. Unless something acts to halt this migration, these natural resources will eventually reach the surface. Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
D、Continued sedimentation—the process of deposits’ settling on the sea bottom—buries the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and gas.As muddy sediments are pressed together, the gas and small droplets of oil may be squeezed out of the mud and may move into sandy layers nearby.Over long periods of time(millions of years), accumulations of gas and oil can collect in the sandy layers.Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment. Unless something acts to halt this migration, these natural resources will eventually reach the surface.
答案D
解析
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