发动机检修以后一般在实验台上进行______和______。
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By "the horse is already out of the barn"(Line 3,Paragraph 3)the author means______.
A. it is too late to do anything
B. we are at a total loss
C. the result is unpredictable
D. people"s lives may be threatened
Which of the following is TRUE of MCI？
A. It may lead to sharp decline in thinking.
B. It relates to Alzheimer"s disease in some way.
C. It is the earliest sign of chronic distress.
D. It can be a result of longtime stress.
In the first paragraph, the author introduces the topic by______.
A. justifying an assumption
B. describing a scene
C. making a comparison
D. challenging a theory
同一部位，放大摄影条件与常规摄影相比，叙述正确的是
A. 两者条件相同
B. 需降低曝光量
C. 需增加曝光量
D. 很难确定增和减
E. 两者必须使用同种增感屏
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