问题
单项选择题
心动周期的特点是（）
A.持续时间与心率无关
B.收缩期大于舒张期
C.舒张期大于收缩期
D.房室收缩时间相同
E.房室舒张时间相同
答案
参考答案：C
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心动周期的特点是（）
A.持续时间与心率无关
B.收缩期大于舒张期
C.舒张期大于收缩期
D.房室收缩时间相同
E.房室舒张时间相同
参考答案：C
| 完形填空。 David is 8. One day his friend Rose __1__ to him, "This Sunday is my birthday. Do you want __2__ to my birthday party?" David says, "Yes." On Sunday, David asks his mother if he can go to the party. His mother says, "Yes, you can go, but you __3__ be polite. Don't __4__ for any food. Someone will give you __5__." "All right, Mum." David answers and he goes to Rose's house __6__ his bike. There are __7__ children at the party. They play together, and then Rose's mother gives them some food. But she forgets David. He __8__ for some time, and then he takes his __9__ to her and says, "Do you want a nice _10__ plate?" | ||||
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