单选题Although he knew little about the large amount of work done in the field, he succeeded ______ other more well-informed experimenters failed. A. which B. that C. what D. where

单选题He( )to get some cards for his birthday, but none arrived.

单选题Just as the builder is skilled in the handling of his bricks, ______ the experienced writer is skilled in the handling of his words. A. as B. thus C. so D. like

单选题He raised his eyebrows and stuck his head forward and ______ it in a single nod, a gesture boy, used then for O. K. when they were pleased.

单选题When plutonium undergoes fission, its atoms break apart, giving off a great deal of energy

单选题I felt as if I ______ from a nightmare. A．wake B．woke C．had wakened D．waked

单选题Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SARS — Severe Acute Respiratory Syndrome — was (1) for the first time in February 2003 in Hanoi, (2) since then has infected more than 1,600 people in 15 countries, killing 63. At this (3) , there are more questions than answers surrounding the disease. Symptoms start (4) a fever over 100.4 degrees F, chills, headache or body (5) . Within a week, the patient has a dry cough, which might (6) to shortness of breath. In 10% to 20% of cases, patients require (7) ventilation to breathe. About 3.5% die from the disease. Symptoms (8) begin in two to seven days, but some reports suggest it (9) take as long as 10 days. Scientists are close to (10) a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence (11) antibiotics or anti-viral medicines help, (12) doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of (13) . Scientists aren't sure yet, but some researchers think it's a (14) discovered corona virus, the family of viruses that cause some common colds. Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care (16) them have been most likely to (17) the illness. But recent developments in Hong Kong suggest that the (18) might spread through air, or that the virus might (19) for two to three hours on doorknobs or other (20) . Health experts say it is unlikely, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.

单选题{{B}}Passage Three{{/B}} Thousands of gypsies have been trying to emigrate to Canada and Britain. They say they are fleeing persecution(迫害), but most have found they are not welcome in these countries either. Gypsies have never had a home. Europe has experienced enormous upheavals this century. Wars, revolutions, separations and elections have changed the political map of the continent countless times. And with each change, power has shifted, creating new winners and new losers. But for one group -- the gypsies -- change has always meant losing. With each upheaval, the gypsies have been left worse off than they were before. Yet they have survived to become Europe's largest minority. Moreover, they have succeeded in preserving their culture and their way of life in the face of genocide (种族灭绝), political persecution and poverty. In other cases where minorities have survived similar persecutions -- like Jews during World War Ⅱ, or blacks in South Africa -- their cause has received international support. By contrast, the gypsies' success at preserving their culture is not regarded as an achievement at all. Instead, it' s viewed as proof they are both unwilling and unable to change, and therefore irredeemable (不可救药的). Indeed, in 1993, the president of the Slovak Republic attacked their way of life and said steps should be taken to limit the extension of this socially unacceptable and mentally backward population. If such a thing had been said about any other minority, the political protest would have been enormous But, bemuse the Slovak President was referring to gypsies, there were few complaints, except from a few small organizations who try to protect gypsies' rights.

单选题Granted that many animals seem to be highly sensitive to various signals ______ earthquakes, the basic question remains of how this behavior can be put to use in earthquake prediction.

单选题They are seeking to ______ the most advanced technological levels in the world. A. obtain B. gain C. attain D. arrive to

单选题 A. clu{{U}}b{{/U}} B. tom{{U}}b{{/U}} C. com{{U}}b{{/U}} D. clim{{U}}b{{/U}}

单选题Young people may grow quickly in some ways and more slowly in ______.

单选题______ for many years, the novelist suddenly became famous. A. Having ignored him B. To be ignored C. Having been ignored D. To have been ignored

单选题John dashed back into the room, and saw ______.A. what wrong wasB. what was wrongC. if wrong wasD. if was wrong