Despite the fact that today viruses
(病毒) are known to cause cancer in animals and in certain plants, there exists a
great reluctance to accept viruses as being of importance in human cancer. Basic
biological phenomena generally do not differ strikingly as one goes from one
species to another. It should be recognized that cancer is a biological problem
and not a problem that is unique for man. Cancer originates when a normal cell
suddenly becomes a cancer cell which multiplies widely and without apparent
restraint. Cancer may originate in many different kinds of cell, but the cancer
cell usually continues to carry certain traits (特性) of the cell of origin. The
transformation of a normal cell into a cancer cell may have more than one kind
of cause, but them is good reason to consider the relationships that exist
between viruses and
A. the fact that viruses have been known to mutate
B. the fact that a cancer-immune individual may lose his immunity
C. the fact that production of human cancer cells might be due to a genetic factor
D. the fact that man is host to many viruses
更多"Passage Three
Despite the"的相关试题:
[单项选择] Passage Three
Despite the fact that today viruses
(病毒) are known to cause cancer in animals and in certain plants, there exists a
great reluctance to accept viruses as being of importance in human cancer. Basic
biological phenomena generally do not differ strikingly as one goes from one
species to another. It should be recognized that cancer is a biological problem
and not a problem that is unique for man. Cancer originates when a normal cell
suddenly becomes a cancer cell which multiplies widely and without apparent
restraint. Cancer may originate in many different kinds of cell, but the cancer
cell usually continues to carry certain traits (特性) of the cell of origin. The
transformation of a normal cell into a cancer cell may have more than one kind
of cause, but them is good reason to consider the relationships that exist
between viruses and
A. viruses are known to cause cancer in animals
B. at present, human cancer is not believed to be contagious (传染的)
C. there are many known causes for the transformation of a normal cell to a cancer cell
D. results of experiments on plants and animals do not vary greatly from species tn species
[单项选择] Passage Three
Despite efforts to provide them with
alternatives such as the shelter, women frequently and repeatedly returned to
violent and abusive partners. By the late 1970s, feminists at Women Together,
like those doing similar work throughout the United States, began to understand
that battered women experience a range of post-traumatic psychological responses
to abuse, similar to those of victims of other types of violence or trauma.
Subsequently, the psychological response of battered women became reified as
"battered woman syndrome," a sub-category of post-traumatic stress disorder.
Interestingly, in the course of trying to create social change, the focus of
feminists perceptibly shifted to trying to explain why battered women fail to
leave the partners who beat them. In trying to address this question, a debate
ensued among feminists a
A. a psychological response.
B. a sub-category of a specific stress disorder.
C. similar to that experienced by a range of victims.
D. all of the above.
E. none of the above.
[单项选择] Passage Three
Three years ago, researchers announced the discovery
of human genes that were capable of turning ordinary cells into malignant ones.
The news met with some skepticism. Experts asked how a single gene could cause
such a dramatic change. Why does cancer take years or even decades to develop if
it is caused by such a simple and direct process In last week’s issue of the,
three research teams answered those questions by setting forth a new model for
understanding the role of oncogenes in cancer.
Each group found
that it does in fact take more than a single gene to produce cancer in normal
cells. Teams at M. I. T and Cold Spring Harbor Laboratory on Long Island, N. Y.
, reported that they could induce cancer in normal rat cells only by inserting
at least two types of oncogene into the cells. "A single oncogene produced some
changes,
A. was caused by normal cells
B. sometimes resulted from internal actions of the victim’s own body
C. was a hereditary disease
D. was a form of malignancy
[单项选择]
Passage Three
Rising Prices Cause House "Apartheid"
涨价导致房屋的“种族隔离”
The Government has admitted that soaring house prices have left people on average incomes, such as teachers and nurses, locked out of buying their first homes across large parts of southern England, including London and most of the South East.
A spokeswoman for the Deputy Prime Minister, John Prescott, admitted last night that there was now an effective "housing apartheid", with people in their own homes pulling further and further away from those yet to get on the property ladder.
With house prices rising at betwe
A. They have to pay high price stamp duty.
B. Their incomes rise too slowly.
C. House supply is decreasing.
D. House prices are rising.
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