When some nineteenth-century New Yorkers said "Har...
When some nineteenth-century New Yorkers said "Harlem", they meant almost all of Manhattan above Eighty-sixth Street. Toward the end of the century, however, a group of citizens in upper Manhattan—wanting, perhaps, to shape a closer and more precise sense of community—designated a section that they wished to have known as Harlem. The chosen area was the Harlem to which Blacks were moving the first decades of the new century as they left their old settlements on the middle and lower blocks of the West Side. As the community became predominantly Black, the very word "Harlem" seemed to lose its old meaning. At times, it was easy to forget that "Harlem" was originally the Dutch name "Harlem", that the community it described had been founded by people from Holland; and that for most of its three centuries—it was first settled in the sixteen hundreds—it had been occupied by White New Yorkers. "Harlem" became synonymous with Black life and Black style. in Manhattan. Blacks living there used the word as though they had coined it themselves—not only to designate their area of residence but to express their sense of the various qualities of its life and atmosphere. As the years passed, "Harlem" assumed an even larger meaning. In the words of Sr. Adam Clayton Powell, the pastor of the Abyssinian Baptist Church, Harlem "became the symbol of liberty and the Promised Land to the Negroes everywhere". By 1919 Harlems population had grown by several thousand. It had received its share of wartime migration from the South, the Caribbean, and parts of colonial Africa. Some of the new arrivals merely lived in Harlem: it was New York they had come to, looking for jobs and for all the other legendary opportunities of life in the city. To others who migrated to Harlem, New York was merely the city in which they found themselves: Harlem was exactly where they wished to be. Question: What does the passage mainly discuss？
A．The origin of the word "Harlem".
B．Migration during the First World War.
C．The history of Black Harlem.
D．Manhattan"s diverse neighborhoods.
AI搜題
NEW
搜題
第1題
A．elaborate style
B．self-enhancement style
C．succinct style
D．self-effacement style
第2題
Scientists said they have found evidence of a giant planet far out in our solar system.In a statement, the California Institute of Technology—Caltech—said this planet travels a very strange “longandthin orbit in the distant solar system.”The discovery was made by two researchers at Caltech: Konstantin Batygin and Mike Brown. They used mathematical modeling and computer simulations (模擬) to find the planet.So far, there have not been any direct observations of the planet. “My jaw hit the floor, ” said astronomer (宇航員) Mike Brown, the moment he realized there might be a ninth planet.
The scientists said it would take this planet 10,000 to 20, 000 years just to make one full orbit around the sun. The new planet, called “Planet Nine ” , has a mass about 10 times the size of Earth.If they are right, the newly found planet would be the ninth planet in our solar system. Pluto (冥王星) had been called the ninth planet until 2006, when it was renamed a “dwarf planet.”
Actual confirmation of a ninth planet would be very big news. “This would be a real ninth planet,” Brown said in the statement. “There have only been two true planets discovered since ancient times, and this would be a third. It&39;s a pretty substantial chunk of our solar system that&39;s still out there to be found, which is pretty exciting.”
While they did not get a picture of “Planet Nine ” yet, the scientists say they are using the biggest—and best—telescopes on Earth to try to find “Planet Nine. ” They are also working on improving their computer simulations. They want to find out more about “Planet Nine’s” orbit, and its impact on the outer part of our solar system.
The newly-found planet ________.
A.moves around the Sun
B.was discovered by two astronomers
C.travels a round orbit
D.is far away from our solar system
The possibility of finding a ninth planet made Mike Brown ________.A.confused
B.frightened
C.satisfied
D.surprised
According to the scientists, ________A.the planet is ten times larger than the Earth
B.ittakes the planet less than 10, 000 yearsto make a full orbit
C.Pluto was once thought to be the ninth planet in the solar system
D.Pluto was given anew name after it was discovered in 2006
It can be inferred from Paragraph 4that ________.A.there is no actual confirmation about the ninthplanet
B.no true planets were discovered in ancient times
C.scientists have found three planets in modern times
D.the ninth planet is the only one discovered since ancient times
To find“Planet Nine”, scientists are using allthe followingEXCEPT ________.A.mathematicalmodeling
B.computer simulations
C.advanced telescopes
D.large spacecrafts
第3題
When
, where V is some known symmetric and positive definite matrix,
in general.
第4題
According to the passage, when the authors began their first studies, they were aware that
A．they would eventually need to design experiments that involved feeding rats high concentrations of protein.
B．tryptophan levels in the blood were difficult to monitor with accuracy.
C．serotonin levels increased after rats were fed meals rich in tryptophan.
D．there were many neurotransmitters whose production was dependent on metabolic processes elsewhere in the body.
E．serotonin levels increased after rats were injected with a large amount of tryptophan.
