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【正文】 B. mostly bee a poet used to have full confidence in higher education. dropout rate of college students seems to go up because___. many students have to earn their own living. in 1998 stemmed form a report published in December 1991 by population geneticists Richard C. Lewontin of Harvard University in Cambridge， Mass.， and Daniel L. Hartl called into question the methods to calculate how likely it is that a match between two DNA fingerprints might occur by chance alone. In particular， they argued that the current method cannot properly determine the likelihood that two DNA samples will match because they came from the same individual rather than simply from two different individuals who are members of the same ethnic group. Lewontin and Hartl called for better surveys of DNA patterns methods are adequate. methods used for blood cell calculation are not accurate not so convincing as to exclude the likelihood that two DNA samples can never e from two individuals samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to e from the same person by is a major problem； most people recognize its importance. a ganger to people‘s health waste of money author condemns noise essentially because it ___. Noise affects us throughout our lives. For example， there are indications of effects on the unborn child when mothers are exposed to industrial and environmental noise. During infancy and childhood， youngsters exposed to high noise levels may have trouble falling asleep and obtaining necessary amounts of rest. academy only is authorized to work out standards for testing attitude of the Federal Bereau of Investigation shows that ____. geneticists like have to submit evidence for their innocence DNA fingerprinting and other DNA analysis techniques have revolutionized criminal investigations by giving investigators powerful new tools in the attempt to trove guilt， not just establish innocence. When used in criminal investigations， a DNA fingerprint pattern from a suspect is pared with a DNA fingerprint pattern obtained from such material as hairs or blood found at the scene of a crime. A match between the two DNA samples can be used as evidence to convict a suspect. education is not enough if one wants to be successful. people don‘t like the intense petition for admission to graduate school. school graduates who aren‘t suitable for college education. Some observers say the fault is with the young people themselves—they are spoiled and they are expecting too much. But that is a condemnation of the students as a whole， and doesn‘t explain all campus unhappiness. Others blame the state of the world， and they are partly right. We have been told that young people have to go to college because our economy can’t absorb an army of untrained eighteenyearolds. But disappointed graduates are learning that it can no longer absorb an army of trained twentytwoyearolds， either. A. Role of Inheritance. A. everything from his mother C. The blood vessels of mother and child do not join directly.t be used in overcrowded areas gas， which can easily catch fire accidents are usually important enough to be reported as news because ____. Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸銨），which is safe unless stored in great quantity. The Flixborough fireball was the fault of management， which took risks to keep producti
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