Structure Dan Written Expression

The correct answer is "the demand for food," fitting the context and completing the sentence meaningfully. This phrase indicates that the demand for food has significantly increased since the early 1950s. The other options don't construct a grammatically sound sentence or lack the appropriate context. Thus, "the demand for food" best describes the increase in global demand for food resources since the early 1950s, emphasizing a significant trend in global food consumption and production.

Gas particles move faster when the gas is hot than when it is cold. This is because temperature is directly related to the average kinetic energy of gas particles. When the gas is heated, the particles gain more energy and move with greater speed. On the other hand, when the gas is cooled, the particles lose energy and move slower. Therefore, the correct answer is "faster".

The correct answer is "has been made." This is because the sentence is in the present perfect tense, which indicates an action that started in the past and continues up to the present. The word "has" is the auxiliary verb for the present perfect tense, and "been made" is the past participle form of the verb "make." Therefore, "has been made" correctly conveys the idea that chairs have been made in various forms throughout history and continue to be made in the present.

The correct word to use is "because," creating a logical connection between the two parts of the sentence. The full sentence with this correct word reads: "Only a few sounds produced by insects are heard by humans because most of the sounds are pitched either too low or too high." This structure indicates that most insect sounds fall outside the range of human hearing, which explains why we only hear a few of them. The word "because" is used to give a reason or explanation, making it the best fit for this context.

Dr. Samuel C.C. Ting received the Nobel Prize in Physics in 1976, despite not attending school until he was twelve years old. This indicates that he was recognized as the recipient or "the winner of" the prestigious award.

As a country transitions from an agricultural to an industrial economy, the attitudes, values, structures, and functions of the family undergo a change. This means that there is a shift in the way families think, their beliefs and principles, the way they are organized, and the roles they play within society. This change is a natural consequence of the economic transformation and the societal shifts that come with it.

The correct phrase is "the different colour of the stars indicate the different temperatures of the star's surfaces." This structure implies that the color variations observed among stars serve as indicators of their surface temperatures. In general, the color of a star can reveal information about its temperature, with blue stars being hotter and red stars cooler. The correct answer maintains clarity and proper syntax, expressing that the color variations among stars are related to their varying surface temperatures.

The phrase "at most" indicates that the maximum amount or limit of the Moon's surface that can be seen from Earth is half. This is because only half of the Moon's surface is illuminated by the Sun, and therefore only that portion is visible to us.

The correct answer is "a nineteenth-century writer." This answer is correct because it accurately completes the sentence by stating that the novels of Constance Fenimore Woolson have a special interest in their regional setting. By specifying that she was a nineteenth-century writer, it implies that her novels would have been set in that time period and therefore have a unique perspective on the region during that era.

For 125 years after its initial use at Harvard in 1642, the Bachelor of Arts degree was the only degree awarded by colleges in the United States.