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A portrait type that appeared with relentless frequency in eighteenth-century England is the familiar image of a gentleman poised with one hand inside his partially unbuttoned waistcoat. Standard interpretations of this portrait posture offer observations of correspondence—demonstrating either that it mirrors actual social behavior or that it borrows from classical statuary. Such explanations, however, illuminate neither the source of this curious convention nor the reason for its popularity. It is true that in real life the “hand-in” was a common stance for elite men. Still, there were other ways of comporting the body that did not become winning portrait formulas. And even if the “hand-in” portrait does resemble certain classical statues, what accounts for the adoption of this particular pose? Which of the following might provide an explanation for the popularity of hand-in portraits that would satisfy the author of the passage? A. An eighteenth-century English etiquette manual discussing the social implications of the “hand-in” stance B. A comprehensive catalogue of eighteenth-century English portraits that showed what proportion of portraits depicted gentlemen in the “hand-in” stance C. A passage from an eighteenth-century English novel in which a gentleman considers what stance to adopt when his portrait is painted Answer: A & C. I understand A is correct. But I don't understand C is correct? Could someone please help me?

Each member of the journalistic pair served as ______ the other: each refrained from publishing a given piece if the other doubted that it was ready to be printed. A a check on B an advocate for C an impediment to D a brake on E an apologist for F an intermediary for Answer is A and D. But I am wondering why not C and D? Could someone please help me here?

The goal of a sunscreen chemical is simple—to prevent harmful UVB (and in some cases UVA) radiation from penetrating the skin. There are two main ways in which this goal can be accomplished—by reflecting (physically blocking) ultraviolet light or by absorbing UV light. Sunscreen chemicals are therefore put into two groups based on which method they employ; they are classified as either physical blockers or chemical absorbers. Physical blockers, the most common of which is titanium dioxide, scatter all radiation in the UVB and UVA range. Titanium dioxide reflects light waves in the 290–770 nm range. However, the vast majority of commercial sunscreens are chemical absorbers. Chemical absorbing sunscreens work on the principle of photo-excitation of electrons. They absorb photons of light of specific wavelengths and use the energy to promote electrons between energy levels. When the electrons later return to the ground energy state, they emit light at longer wavelengths (lower energies). Chemical species that exhibit this behavior are called chromophores. The specific wavelength absorbed by a given chromophore is determined by the discrete quantal amounts of energy that are required to excite electrons between the energy levels or its molecules. Since the primary objective of an absorbing sunscreen is to absorb UVB light (290–320 nm), the best sunscreens are those that absorb most heavily in this range. The chromophores that most readily fit this requirement are those with conjugated pi-bonding systems. 171. Based on the passage, which of the following can be inferred about the chromophores referred to in the final sentence of the passage? (A) If exposed to light with wavelengths of approximately 300 nm, they will scatter the radiation. (B) If exposed to light with wavelengths in the 290–320 nm range, they will lower the energy level of some of their constituent electrons. © If exposed to light waves in the 290–770 nm range, they will absorb the photons and emit them as light of longer wavelengths. (D) If exposed to light with wavelengths of approximately 300 nm, some electrons in their component molecules will switch to higher energy levels. (E) If exposed to light waves in the 290–320 nm range, they will promote the discrete quantal amounts of energy that are required to excite electrons between energy levels. Here the answer is D. I am wondering why not E. Could someone please explain it to me? Thanks in advance!

Queen Blanche's brothers, Louis and Robert, were appointed vassals to her spouse only in 1345, more than a decade after her coronation. Could someone please explain me the meaning of the underlined part?

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