问题
不定项选择
血流哪圆形是肝细胞肝癌的特异性表现 （
A．类圆形的实性团块
B．局部轮廓隆起
C．外周绕有声晕，内有“块中块”或“镶嵌征”
D．绕有强回声边缘的结节
E．外周血管受压
答案
参考答案：C
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血流哪圆形是肝细胞肝癌的特异性表现 （
A．类圆形的实性团块
B．局部轮廓隆起
C．外周绕有声晕，内有“块中块”或“镶嵌征”
D．绕有强回声边缘的结节
E．外周血管受压
参考答案：C
Directions: There are 4 passages in this part. Each of the passages is followed by ,5 questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
Passage One
| In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic (运动的) molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion. A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists’ predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected. Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said: "Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science anymore than a pile of bricks can be called a house. " Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. In a way, any hypothesis is a leap into the unknown. It extends the scientist’s thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories. |
Which of the following statements is supported by the passage
A．A scientist’s most difficult task is testing hypotheses.
B．It is better to revise a hypothesis than to reject it.
C．Theories are simply imaginary models of past events.
D．A good scientist needs to be creative.