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白喉毒素致病机制是（ ）|破伤风痉挛毒素致病机制是（ ） A. 抑制易感细胞的蛋白质合成 B. 破坏细胞膜使细胞裂解 C. 阻断上、下神经元之间正常抑制性介质的传递，导致肌肉痉挛 D. 抑制神经末梢释放乙酰胆碱，影响神经冲动的传递，导致肌肉迟缓型麻痹 E. 激活细胞内腺苷酸环化酶，使cAMP的水平增高，使粘膜细胞的分泌功能增强
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【单选题】听力原文：W: Sam, could you review the results of the survey on leisure sporting activities again? We need to plan out our proposal for this Friday's business meeting. M: Sure, Gary. I've summarized the re...
A.
Leisure sporting activities.
B.
Average age of athletes.
C.
Durability of sporting equipment.
D.
Friday's business meeting.
【单选题】听力原文： The first 'National Sample Survey of People's Reading Trends' was successfully accomplished. The survey shows that in modern Chinese society, 'reading' is not limited to books, newspapers and ma...
A.
TV programs.
B.
VCDs.
C.
Newspapers and magazines.
D.
Radio programs.
【简答题】听力原文： According to a recent survey on leisure activities, American people spend about 4 hours each day watching TV, 3 hours listening to the radio, and 14 minutes reading magazines. It was also disclo...
【简答题】下列有关固定资产的说法中，正确的是（ ）。
【单选题】听力原文：The survey report, which was recently submitted by the international investment department, caused controversy within the board of directors. (30)
A.
The investment department submitted a survey report to the board of directors.
B.
The investment department refuted the decision made by the board of directors.
C.
The board of directors could not agree on the content of the survey report.
D.
The board of directors were not concerned with the department's survey report.
【单选题】听力原文： When the United States Geological Survey makes its annual report on earthquakes, California usually leads the nation in the number of tremors that people, rather than measuring instruments, can ...
A.
A significant earthquake occurs in the United States.
B.
A significant earthquake occurs in the ocean.
C.
A significant earthquake does not kill anybody.
D.
A significant earthquake usually measures over 6.5 on the Richter scale.
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