题目

某哺乳动物主动脉、左心室及左心房的血压变化如图所示。 （1） 该哺乳动物心脏每分钟跳动约次(计算结果保留整数)。 （2） 左心房中血压相对较低，作用是 。 （3） 区间Ⅱ对应的心脏血液流动模型是。 A . B . C . D . 答案：【1】86(81~88之间均可) 【1】有利于肺静脉中的血液流回心脏 CWe have two daughters: Kristen is seven years old and Kelly is four. Last Sunday evening, we invited some people home for dinner. I dressed them nicely for the party, and told them that their job was to join Mommy in answering the door when the bell rang. Mommy would introduce them to the guests, and then they would take the guests’ coats upstairs and put them on the bed in the second bedroom.The guests arrived. I introduced my two daughters to each of them. The adults were nice and kind and said how lucky we were to have such good kids.Each of the guests liked Kelly more, the younger one, enjoying her dress, her hair and her smile. They said she was a unusual girl to be carrying coats upstairs at her age.I thought to myself that we adults usually make a big “to do” over the younger one because she’s the one who seems more easily hurt. We do it with the best of intentions.But we seldom think of how it might affect（影响） the other child. I was a little worried that Kristen would feel she was being paid no attention. I was about to serve dinner when I realized that she had been missing for twenty minutes. I ran upstairs and found her in the bedroom, crying. I said, “What are you doing here, my dear?”She turned to me with a sad expression and said,” Mommy, why don’t people like me the way they like my sister? Is it because I’m not pretty? Why don’t they say nice things about me as much?”I tried to explain to her, kissing and hugging（拥抱） her to make her feel better.Now whenever I visit a friend’s home. I make it a point to speak to the elder child first1.The underlined expression “make a big ‘to do’ over” (paragraph 4) means_______A.show much concern aboutB.have a special effect onC.list jobs to be done forD.do good things for2.We can conclude from the passage that_______A.parents should pay more attention to the elder childrenB.the younger children are usually more easily hurtC.people usually like the younger children moreD.adults should treat children equally3.Kristen felt sad and cried because_______A.the guests gave her more coats to carryB.she didn't look as pretty as KellyC.the guests enjoyed her sister more than herD.her mother didn’t introduce her the guests