为了使肌细胞质膜去极化，肌质网(SR)中的Ca2+泵使用ATP水解释放的能量将Ca2+从SR的腔输往胞质溶胶，以启动肌收缩。
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When Florence said "I'm more of a creature to polish my mind than polish my furniture" (Line 2, Para. 1) , she meant that______.
A. she was tired of learning
B. she was thirsty for knowledge
C. she was more suitable for doing housework
D. she didn't have enough time to keep the house clean
1949年中华人民共和国的成立，标志着中国进入()。
A. 旧民主主义向新民主主义的过渡时期
B. 新民主主义向社会主义的过渡时期
C. 新民主主义革命到建设的过渡时期
D. 社会主义革命到建设的过渡时期
新中国成立初期与苏联签订的条约是()。
A. 《中苏友好同盟条约》
B. 《中苏同盟互助条约》
C. 《中苏友好条约》
D. 《中苏友好同盟互助条约》
According to the passage, how to make a good impression？
A. By wearing party clothes.
By introducing yourself to your supervisor.
C. By arriving 15 minutes early.
D. By asking for your job duties and setting goals.
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