GED-Science 無料問題集「GED Science」
Earth's system is observed by noting changes and interactions of the oceans, land, the atmosphere, and organisms. Some of these changes and interactions happen daily, while others take place over long periods of time.
Which of the following changes and interactions happen on a daily basis?
Which of the following changes and interactions happen on a daily basis?
正解：A
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Vertebrates, animals with backbones, are divided into the following five major groups: fish, reptiles, amphibians, birds, and mammals. Some characteristics of these groups are given in the table below.
Which statement is true if an animal lives in water, does not lay eggs, and is warmblooded?
Exhibit:
Which statement is true if an animal lives in water, does not lay eggs, and is warmblooded?
Exhibit:
正解：B
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-- Exhibit -
Our genes consist of DNA molecules. DNA fingerprinting allows the detection of DNA fragment patterns in different people. In this process, enzymes are used to "cut" a person's DNA into pieces. The length of these fragments differs from person to person and, therefore, there is little chance that two or more people will produce the same pattern. The DNA fragments of different people can be readily compared. DNA fingerprinting has many applications in law enforcement, medicine, and other areas.
The diagram below lists simulations of the DNA "fingerprint" band patterns for six individuals-a missing child and five young people who have the missing child's physical characteristics.
-- Exhibit -
Based on the DNA diagram, which of the five children might be related to the missing child?
Our genes consist of DNA molecules. DNA fingerprinting allows the detection of DNA fragment patterns in different people. In this process, enzymes are used to "cut" a person's DNA into pieces. The length of these fragments differs from person to person and, therefore, there is little chance that two or more people will produce the same pattern. The DNA fragments of different people can be readily compared. DNA fingerprinting has many applications in law enforcement, medicine, and other areas.
The diagram below lists simulations of the DNA "fingerprint" band patterns for six individuals-a missing child and five young people who have the missing child's physical characteristics.
-- Exhibit -
Based on the DNA diagram, which of the five children might be related to the missing child?
正解：C
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Many years ago, beavers were introduced to a region of California that they had not previously inhabited. Forty years later, the beaver population had grown so much that a cluster of aspen trees used by the beavers for food and building materials inside the national forest became endangered. The beavers were also interfering with the water systems.
In retrospect, how would biologists most likely evaluate the impact of the introduction of the beaver?
In retrospect, how would biologists most likely evaluate the impact of the introduction of the beaver?
正解：E
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A study in Florida has revealed that the sex characteristic of an alligator is determined by temperature. Alligator eggs incubated at 30(degrees) C (86(degrees) F) hatched into female offspring. Eggs incubated at 34(degrees) C (93(degrees) F) resulted in male offspring. At the latter temperature, androgenic hormones are produced inside the eggs, resulting in the formation of male sex organs. At a temperature of 30(degrees) C, estrogenic hormones are produced, leading to the formation of female sex organs.
Based on the information above, which statement is most correct?
Based on the information above, which statement is most correct?
正解：E
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In the diagram below, the shaded parts show how much water each boat displaces as it floats. Boat B weighs more than boat A, since it has more people aboard. Boat B displaces more water than does boat A.
For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.
-- Exhibit -
In the diagram below, the shaded parts show how much water each boat displaces as it floats. Boat B weighs more than boat A, since it has more people aboard. Boat B displaces more water than does boat A.
For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.
Flood waters do not have to be very deep to float a car. In fact, only two feet of water, about knee high, will float the average car.
Which statement BEST explains why a car floats in such a small amount of water?
For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.
-- Exhibit -
In the diagram below, the shaded parts show how much water each boat displaces as it floats. Boat B weighs more than boat A, since it has more people aboard. Boat B displaces more water than does boat A.
For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.
Flood waters do not have to be very deep to float a car. In fact, only two feet of water, about knee high, will float the average car.
Which statement BEST explains why a car floats in such a small amount of water?
正解：B
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The death rate from heart disease fell more than 8 percent in just one year during the 1980s. Advances in public awareness of heart disease and in treatments for it are thought to be partially responsible for the decline. New heart drugs, a technique called angioplasty for clearing the arteries, and surgical advances have also assisted in reducing heart disease fatalities, as has increased interest in a healthy lifestyle and diet.
Which of the following was a contributing factor for the more than 8-percent decrease in heart disease mortality between 1988 and 1989?
Which of the following was a contributing factor for the more than 8-percent decrease in heart disease mortality between 1988 and 1989?
正解：E
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The energy of an earthquake may cause other catastrophic events that continue long after the ground stops shaking. For instance, fires caused after the San Francisco earthquake of 1906 killed more than 200 people. However, not all deaths are necessarily confined to the immediate area of an earthquake. The effects of a Chilean earthquake in 1960-the strongest ever recorded-killed hundreds of people who lived thousands of miles away, from Hawaii, the Philippines, and Japan.
Which event was most likely the reason for the loss of life in Hawaii, the Philippines, and Japan in 1960?
Which event was most likely the reason for the loss of life in Hawaii, the Philippines, and Japan in 1960?
正解：A
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