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单项选择题

4.5.3.房室延搁的生理意义是
A、使心房、心室不会同时收缩；
B、增强心肌收缩力；
C、使心室肌动作电位幅度增加；  
D、使心室肌不会产生完全强直收缩；

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单项选择题
Karen Maclnnes had spent nine months in the hospital. As she grew weaker, the 16-year-old girl asked her parents, "Am I going to die?"
Her mother told Karen the truth. After learning the bad news, all Karen wanted was to go home. Her parents decided to satisfy her wish－no matter that medical fund（基金）, which had helped pay for Karen's hospitalization, would not cover any of the full time medical care she would need at home. When she was carried through her front door, Karen smiled for the first time in months.
A friend of the Maclnnes family, Sheila Petersen, knew of this and offered to help. She volunteered（自愿）not only to find nurses, but also to raise money for Karen's care. Money was received from so many people that Sheila created a fund, "Friends of Karen".
After leaving the hospital, Karen lived for 11 months. "And those months were happy ones for her," says her mother, "thanks to Sheila."
Even after Karen died, people kept sending money. Sheila put it into the fund, tried to find someone else who needed help. By last month, Friends of Karen was helping 70 families.
"I still have a relationship with each family," says Sheila. "We have four children who are near death now, and I want to be there for them." Sheila admits（承认）the work is sometimes difficult, but says, "the smile on a child's face makes it all worthwhile（值得的）."
Karen lived for ____ since she had got out of the hospital.
A.elevenmonths
B.ninemonths
C.twentymonths
D.twelvemonths
单项选择题
‌在实际经济生活中，有些产品的市场价格不能真实反映国民对项目的投入和产出，在这种情况下进行经济分析时，必须采用（ ）‏
A、市场价格
B、不变价格
C、可变价格
D、影子价格
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当客厅不供暖时，计算房间的内墙耗热量，内墙的温差修正系数a值为( )。
A.约等于1
B.约等于0.7
C.约等于0.4
D.以上都不对
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