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心交感神经引起心缩力加强的主要机制是A、明显增加Ca2+通道开放概率B、减弱自律细胞4期的内向电流C、使复极相K+外流减慢D、减弱肌钙蛋白的Ca2+亲和力E、能量的利用效率提高

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单项选择题
Which one is equivalent to“captain”？
A、副驾驶员
B、机长
C、乘务员
D、地勤
未知题型
Directions：For this part, you are allowed 30 minutes to write a short essay entitled Cell Phones. You should write at least 150 words and based on the following gragh and the outline given below in Chinese:
1.描述所示的手机用户变化情况(据统计，2007年上半年手机用户量超过5亿)
2. 出现这种情况的原因
3. 对此现象做出评价
单项选择题
【判断题】The Red tourism is a kind of themed tourism activities, with the memorial sites and landmarks formed during the revolution and wars led by the Communist Party of China as the carrier, with the revolutionary history, revolutionary deeds and revolutionary spirits carried as the connotation, which organizes and receives tourists to carry out memorial studies, visits and tours.红色旅游是“以中国共产党领导人民在革命和战争时期建树丰功伟绩所形成的纪念地、标志物为载体,以其所承载的革命历史、革命事迹和革命精神为内涵,组织接待旅游者开展缅怀学习、参观游览的主题性旅游活动” 。 A.
True 正确 B.
False 错误
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