子囊盘（apothecium）

Almost everyone likes dogs, and almost everyone likes to read about dogs. I have a friend. He has a big police dog with the name Jack. Police dogs are very clever. Every Sunday afternoon my friend takes Jack for a long walk in the park. Jack likes these long walks very much.

One Sunday afternoon a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack for a walk. But the visitor still stayed. Jack became much worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention to Jack. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor’s cap in his mouth.

小题1: The young visitor stayed a long time in my friend’s house, didn’t he?

A．Yes, he was.

B．Yes, he did.

C．No, he wasn’t.

D．No, he didn’t.小题2:Jack became worried because _______ .

A．he wanted to go out for a walk.

B．he wanted to play with him

C．he didn’t know the young man

D．he wanted to eat something小题3:The visitor went on talking and he_______.

A．paid no attention to his cap

B．didn’t like Jack

C．didn’t know that his cap was taken away by Jack

D．paid no attention to Jack

学习的目的是在于应用。请根据你所掌握的化学知识，解释或解决以下生活中的一些常见问题。

（1）要区分硬水与软水，可以使用的物质是               ；

（2）进行水的净化时，除去其中的难溶性杂质应采用的方法是________________；

（3）要区分一氧化碳和二氧化碳两种无色气体，可采用的方法是___________；（写一种即可）

（4）为保证人身安全，进入久未开启的菜窖前，须做________________试验；

（5）点燃可燃性气体前应进行________________。

如图，长为a、宽为b的矩形线框的左半侧处在磁感应强度为B的匀强磁场中，磁场方向与线框平面垂直，线框的对称轴MN恰与磁场边缘平齐。若第一次将线框从磁场中以恒定速度v向右匀速拉出，第二次以同样大小的线速度v让线框转过90°。两次过程中，线框产生的平均感应电动势之比为___________；第一次线框运动到磁场边缘时与第二次线框转过90°时（左侧边均未离开磁场），两次线框的瞬时发热功率之比为___________。

医生甲因犯罪被判处有期徒刑2年，1997年9月20日被捕，1999年9月20日释放，医生甲从哪日起可以重新申请执业注册（）

A.1999年9月21日

B.2000年3月21日

C.2000年9月21日

D.2001年3月21日

E.2001年9月21日