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OG19-语文分册 OG20-语文分册	Patrick usually provides child care for six children. Parents leave their children at Patrick's house in the morning and pick them up after work. At the end of each workweek, the parents pay Patrick at an hourly rate for the child care provided that week. The weekly income Patrick receives is usually adequate but not always uniform, particularly in the winter, when children are likely to get sick and be unpredictably absent. Which of the following plans, if put into effect, has the best prospect of making Patrick's weekly income both uniform and adequate?
OG19-语文分册 OG20-语文分册	In theory, international civil servants at the United Nations are prohibited from continuing to draw salaries from their own governments; in practice, however, some governments merely substitute living allowances for their employees' paychecks, assigned by them to the United Nations.
	Carotenoids, a family of natural pigments, form an important part of the colorful signals used by many animals. Animals acquire carotenoids either directly (from the plants and algae that produce them) or indirectly (by eating insects) and store them in a variety of tissues. Studies of several animal species have shown that when choosing mates, females prefer males with brighter carotenoid-based coloration. Owens and Olson hypothesize that the presence of carotenoids, as signaled by coloration, would be meaningful in the context of mate selection if carotenoids were either rare or required for health. The conventional view is that carotenoids are meaningful because they are rare: healthier males can forage for more of the pigments than can their inferior counterparts. Although this may be true, there is growing evidence that carotenoids are meaningful also because they are required: they are used by the immune system and for detoxification processes that are important for maintaining health. It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females. Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems, whereas males that are genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead.
OG18-语文分册	According to the "conventional view" referred to in line 13 of the passage, brighter carotenoid-based coloration in certain species suggests that an individual
Ready4	Archeology has undoubtedly enriched mankind's understanding of history more than any other discipline. Archeology has unraveled a great part of man's unwritten past. Studying the material remains of past human life and activities may not seem important or exciting to the average person when compared to other scientific pursuits like the biological sciences. But archeology's aim to understand mankind is a noble endeavor that goes well beyond uncovering buried treasures. Knowing what made past cultures cease to exist may indeed provide the key to making sure that history does not repeat itself. However, when it comes to dating archeological samples, several timescale problems arise. For example, Christian time counts the birth of Christ as the beginning, AD 1 (Anno Domini); everything that occurred before Christ is counted backwards from AD as BC (Before Christ). The Greeks consider the first Olympic Games as the beginning or 776 BC. The Muslims count the Prophet's departure from Mecca, or the Hegira, as their beginning at AD 662. The Mayan calendar used 3114 BC as their reference. As a result, carbon dating began to emerge as the most popular and accepted form of determining the absolute dating of artifacts and events. However, this technique is not without its limitations or risks. First, the size of the archeological sample is important. Larger samples are better because purification and distillation remove some matter. Although new techniques for working with very small samples have been developed, like accelerator dating, these are very expensive and still somewhat experimental. Second, because the decay rate is logarithmic, radiocarbon dating has significant upper and lower limits. It is not very accurate for fairly recent deposits. In recent deposits so little decay has occurred that the error factor (the standard deviation) may be larger than the date obtained. Despite all of this, carbon dating remains a useful tool for archeological research, helping archeologists obtain a much needed global perspective on the timing of major prehistoric events.
Ready4	If $\frac{27}{0.5 + y} = 6$ , then $y =$
Ready4	If it takes 65 minutes to drive s miles, how many minutes will it take to drive r miles at the same rate?
Ready4	If $2^n$ is a divisor of $1{,}680$ and $2^m$ is not a divisor of $1{,}680$ , where $m=n+1$ , what is the value of $n$ ?
Ready4	How many hours does it take Jay to paint p rooms if he paints at the rate of q rooms per hour?
Ready4	A total number of paperclips can be divided into 24 smaller piles of an equal number of clips each or 30 smaller piles of an equal number of clips each. What is the lowest possible total number of paperclips?
Ready4	A stairway is formed by stacking even blocks next to and on top of each other. If the stairway depicted above is 5 blocks in length and 4 blocks in height, with a thin step at the beginning that does not require a block, and the stairway is only 1 block in width, how many blocks will be required to build such a stairway 20 blocks in length?
Ready4	At 3:00 pm, a car has driven 30 miles east. It will continue to drive east at 0.8 minutes per mile and then turn around and drive at 0.8 minutes per mile back to its original starting point. How far can it drive before turning around in order to arrive back to its original starting point by 3:40 pm?
Ready4	Company X bought a shipment of light bulbs at $3 per bulb, paid $1,200 to store and ship the bulbs, and later sold the bulbs for $13 per bulb. The gross profit earned from these sales is the total income from sales minus the total cost. If a batch contained 1,500 light bulbs, then Company X's gross profit per bulb is
Ready4	In the figure above, AC passes through the center of the square ABCD, and CE is perpendicular to AC. What is the minimum number of degrees the square must be rotated so that BC will be parallel to EC?
Ready4	In the figure above, EF is a diameter of the circle with center O and is perpendicular at each end to the trapezoid ABCD. If the area of the circle is $225 π$ , the length of AD is 20 and the length of BC is 10, what is the area of the ABCD?
Ready4	On Wednesday, a restaurant sold a quantity of wine in 6 ounce servings, and on Thursday, it sold the same total quantity of wine in 4 ounce servings. If the price on Wednesday was $9.00 per glass, and the revenue on Thursday was $\frac{3}{4}$ that of the revenue on Wednesday, what was the price per glass of the wine on Thursday?
Ready4	If $3 < y < 150$ , for how many values of y is the square root of y twice a prime number?
Ready4	$\frac{1}{3}+\bigg[\bigg(\frac{10}{7}*\frac{7}{12}\bigg)\div6\bigg]-\frac{11}{12}=$
Ready4	Chris' average (arithmetic mean) daily expenses were $500 per day over a 15-day trip. During this period, if Chris' average daily expenses were $450 for the first 5 days, what were the average daily expenses for the last 10 days?
Ready4	If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately $\frac{70}{r}$ years. If Chris invests $1,000 in a bond that pays 4 percent interest, compounded annually, what will be the approximate total amount of the investment 35 years later?