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【简答题】
在心房和心室之间正是因为有了 ______ ,才能保证血液只能从 ______ 流向 ______ .而在心室和动脉之间也正是由于有了 ______ ,才能保证血液只能从 ______ 流向 ______ .
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反馈参考答案：
举一反三
【单选题】比例宜注写在图名的( ),字的基准线应取平,比例的字高宜比图名的字高( )
A.
右侧 、 小一号或二号
B.
左侧 、 小一号或二号
C.
右侧 、 大一号或二号
D.
左侧 、 大一号或二号
【单选题】听力原文：M: Was Bill always rich? W: When I knew him as a young man he wore old clothes and did not even have a bicycle. Now he wears expensive clothes and drives a sports car. Q: What did Bill use to be?...
A.
He used to be rich.
B.
He used to be poor.
C.
He used to be very thin.
D.
He used to be a driver.
【简答题】How old was Tsinghua University at that time and when was Bill Gates' first visit?
【多选题】以下描述正确的有哪些?( )
A.
镜头的速度是指特定的镜头在特定的时间内所能传送的光量。
B.
镜头加膜的作用：可减少镜头表面的反射光的损失，增大光线的通过率。
C.
可更换镜头的照相机，其镜头可以取下来并更换上其他的镜头。
D.
光圈数值越大，光孔越大。
【简答题】A．The bill was not clear enough. B．The bill was sent to a wrong address. C．Incorrect bills were sent to her now and then. D．The clerks were rather rude to her.
【单选题】Why was Bill carrying so many things home on the day they first met?
A.
He was very sad.
B.
He wanted to clean his locker.
C.
He wanted to commit suicide.
D.
He did not want to cause others any trouble.
【单选题】根据听到的内容，回答问题 Why was Bill unhappy about the game? 查看材料
A.
Some players played poorly．
B.
The scores were too close．
C.
It lasted too long．
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