更多"During the 1800's and early 1900's,"的相关试题:
[单项选择]Several international events in the early 1990s seem likely to______, or at least weaken, the trends that emerged in the 1980s.
A. retrieve
B. revolve
C. reverse
D. revive
[单项选择]
Passage One
Since the early 1980s, scientists have revealed some 40 human genes involved in cancer. These genes are essential for normal growth, but can be subverted to cause a tumor.
Dr. Jorge Yunis of the University of Minnesota Medical School in Minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near inherited weak points on chromosomes(染色体). Varying from individual to individual, vulnerable to chemical carcinogens(致癌剂), X rays and other cancer-inducing agents.
"If a chromosome snaps apart in the immediate vicinity of an oncogene," says Yunis, "normal genetic control mechanisms could break down and the stage would be set for the formation of cancer." Younis has shown that such a sequence occurs at the beginning of numerous leukemias (白血病), lymphomas(淋巴瘤) and some tumors of the lung, colon(结肠) and breast.
Yunis and other investigators have found that petroleum-based products--notabl
A. Scientific Findings.
B. Cancer-causing Genes.
C. Chromosome.
D. How Cancer Is Forme
[单项选择] In the early 1960s Wilt Chamberlain was one of the only three players in the National Basketball Association (NBA) listed at over seven feet. If he had played last season, however, he would have been one of 42. The bodies playing major professional sports have changed dramatically over the years, and managers have been more than willing to adjust team uniforms to fit the growing numbers of bigger, longer frames.
The trend in sports, though, may be obscuring an unrecognized reality: Americans have generally stopped growing. Though typically about two inches taller now than 140 years ago, today’s people—especially those born to families who have lived in the U.S. for many generations—apparently reached their limit in the early 1960s. And they aren’t likely to get any taller. "In the general population today, at this genetic, environmental level, we’ve pretty much gone as far as we can go," says anthropologist William Cameron Chumlea of Wright State University. In the case of NBA
A. illustrate the change of height of NBA players.
B. show the popularity of NBA players in the U.S.
C. compare different generations of NBA players.
D. assess the achievements of famous NBA players.
[单项选择]（ ） came into service in the early 1980s.
A. The Comet
B. The Boeing 747
C. The Boeing 757
D. The Boeing 767
[单项选择]Since the early 1990s, conservationists have （ ） protecting the Amazon in part because of its abundance of plant and animal species.
A. called forth
B. called back
C. called up
D. called for
[单项选择]While serving in the Senate in the early 1970s Barbara Jordan supported legislation to ban discrimination and to deal with environment problems.
A. list
B. forbid
C. handle
D. investigate
[单项选择]In the early 1900s, （ ） started the first chain operation in the United States.
A. Kemmons Wilson
B. Ellsworth Statler
C. Conrad Hilton
D. Thomas Cook
[单项选择]Rock'n'roll in the early 1960s in the United States was music for ______.
A. teenagers
B. black people
C. White people
D. people of all ages
