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OG19-语文分册 OG20-语文分册
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The passage supports which of the following statements about sixteenth-century European fishing crews working the waters off Newfoundland?
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Researchers studying how genes control animal behavior have had to deal with many uncertainties.In the first place, most behaviors are governed bymore than one gene, and until recently geneticists had no method for identifying the multiple genes involved. In addition, even when a single gene is found to control a behavior, researchers in different fields do not necessarily agree that it is a "behavioral gene."Neuroscientists, whose interestin genetic research is to understand the nervoussystem(which generates behavior), define the term broadly. But ethologists-specialists in animal behavior-are interested in evolution, so they define the term narrowly. They insist that mutations in a behavioral gene must alter a specific normal behavior and not merely make the organism il, so that the genetically induced behavioral change will provide variation that natural selection can act upon, possibly leading to the evolution of a new species. For example, in the fruit fly, researchers have identified the gene Shaker, mutations in which cause flies to shake violently under anesthesia. Since shaking is not healthy, ethologists do not consider Shaker a behavioral gene. In contrast, ethologists do consider the gene period(per), which controls the fruit fly's circadian (24-hour) rhythm,a behavioral gene because flies with mutated per genes are healthy; they simply have different rhythms.
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OG19-语文分册 OG20-语文分册
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The primary purpose of the passage is to
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In a 1918 editorial,W.E.B. Du Bois advised African Americans to stop agitating for equality and to proclaim their solidarity with White Americans for the duration of the First World War. The editorial surprised many African Americans who viewed Du Bois as an uncompromising African American leader and a chief opponent of the accommodationist tactics urged by Booker T. Washington. In fact, however, Du Bois often shifted positions along the continuum between Washington and confrontationists such as William Trotter. In 1895, when Washington called on African Americans to concentrate on improving their communities instead of opposing discrimination and agitating for political rights, Du Bois praised Washington's speech. In 1903, however, Du Bois aligned himself with Trotter, Washington's militant opponent, less for ideological reasons than because Trotter had described to him Washington's efforts to silence those in the African American press who opposed Washington's positions. Du Bois's wartime position thus reflected not a change in his long-term goals but rather a pragmatic response in the face of social pressures: government officials had threatened African American journalists with censorship if they continued to voice grievances. Furthermore, Du Bois believed that African Americans' contributions to past war efforts had brought them some legal and political advances. Du Bois's accommodationism did not last, however. Upon learning of systematic discrimination experiencedby African Americans in the military, he called on them to "return fighting"from the war.
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OG19-语文分册
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The passage suggests which of the following about the
contributions of African Americans to the United States
war effort during the First World War?
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OG19-语文分册
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The author of the passage refers to Washington's call
to African Americans in 1895 primarily in order to
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OG19-语文分册
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According to the passage, which of the following is
true of the strategy that Du Bois's 1918 editorial urged
African Americans to adopt during the First World War?
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OG19-数学分册
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There are 5 cars to be displayed in 5 parking spaces, with all the cars facing the same direction. Of the 5 cars, 3 are red, 1 is blue, and 1 is yellow. If the cars are identical except for color, how many different display arrangements of the 5 cars are possible?
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OG19-数学分册
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If 4 < $$\frac{7-x}{3}$$, which of the following must be true?
I. 5 < x
II. | x + 3| > 2
Ill. -(x + 5) is positive.
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OG19-数学分册
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A certain right triangle has sides of length x, y, and z, where x < y < z. If the area of this triangular region is 1, which of the following indicates all of the possible values of y?
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OG19-数学分册
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In the figure above, point O is the center of the circle and $$OC =AC= AB$$. What is the value of x ?
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OG19-数学分册
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An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B $$2\frac{1}{2}$$ hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C $$1\frac{1}{6}$$ hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the $$\underline {least}$$ total amount of time the passenger must spend between flights if all flights keep to their schedules?
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OG19-数学分册
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If n is a positive integer and $$n^{2}$$ is divisible by 72, then the largest positive integer that must divide n is
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OG19-数学分册
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If x, y, and z are positive integers such that x is a factor of y, and x is a multiple of z, which of the following is NOT necessarily an integer?
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OG19-数学分册
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Running at their respective constant rates, Machine X takes 2 days longer to produce w widgets than Machine Y. At these rates, if the two machines together produce $$\frac{5}{4}$$w widgets in 3 days, how many days would it take Machine X alone to produce 2w widgets?
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OG19-数学分册
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A square wooden plaque has a square brass inlay in the center, leaving a wooden strip of uniform width around the brass square. If the ratio of the brass area to the wooden area is 25 to 39, which of the following could be the width, in inches, of the wooden strip?
I. 1
II. 3
Ill. 4
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OG19-数学分册
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$$\frac{2\frac{3}{5}-1\frac{2}{3}}{\frac{2}{3}-\frac{3}{5}}$$=
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OG19-数学分册
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What is the value of the integer x?
(1) x rounded to the nearest hundred is 7,200.
(2) The hundreds digit of x is 2.
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OG19-数学分册
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In a certain factory, hours worked by each employee in excess of 40 hours per week are overtime hours and are paid for at $$1\frac{1}{2}$$ times the employee's regular hourly pay rate. If an employee worked a total of 42 hours last week, how much was the employee's gross pay for the hours worked last week?
(1) The employee's gross pay for overtime hours worked last week was $30.
(2) The employee's gross pay for all hours worked last week was $30 more than for the previous week.
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OG19-数学分册
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If x > 0, what is the value of $$x^{5}$$ ?
$$\sqrt{x}$$=32
$$x^{2}=2^{20}$$
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