問題詳情
Today’s topic is blood. Blood is indeed in the news, for on the __(1)__ of that announcement comes a report of tests __(2)__ in the United States and Japan __(3)__ artificial blood. After an accident, time is crucial for a person suffering from extensive blood loss, and transfusion of real blood must often __(4)__ a time-consuming test for blood type. Plasma does not require such a test but, because it can carry little oxygen, it is not a wholly satisfactory substitute. Perfluorocarbons appear to offer an answer. They are utilized in combination with an emulsion called Fluosol-DA, which provides a number of additional advantages __(5)__ real blood. These include the absence of a need for blood tests, the fact that it can be frozen for as long as two years, its elimination eventually as a gas through the lungs, and the impossibility of its transmitting such problems as hepatitis.
1.
(A) feet
(B) heels
(C) legs
(D) steps
1.
(A) feet
(B) heels
(C) legs
(D) steps
參考答案
答案：B
難度：適中0.641026
統計：A(2),B(25),C(2),D(8),E(0)
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