滴眼药时，正常结膜囊最多可容纳的药液量为（） A.10μl B.20μl C.30μ

Do you know how to play a game called “Musical Chairs”？ It is easy to play and most people enjoy it. All you need are some chairs， some people and some way of making music. You may use a piano or any other musical instrument， if someone can play it. You may use a tape recorder. You can even use a radio.

Put the chairs in a row. The chairs may be put in twos， back to back. A better way is to have the chairs in one row with each chair facing in the opposite direction to the chair next to it.

The game is easy. When the music starts， the players walk round the chairs. Everyone goes in the same direction， of course， they should walk in time to the music. If the music is fast they should walk quickly. If the music is slow， they should walk slowly.

The person playing music cannot see the people in the game. When the music stops， the players try to sit on the chairs. If a person cannot find a chair to sit on， he drops out. Then， before the music starts again， one chair must be taken away. When the music stops again， one more player will be out.

At last， there will be two players and one chair. The one who sits on the chair when the music stops is the winner.

小题1:If ten people are playing musical chairs， you must begin with _______.

A．nine chairs

B．ten chairs

C．eleven chairs

D．one chair小题2:Which of the following is not suitable for playing musical chairs？ _______.

A．A piano

B．A radio

C．A tape recorder

D．A telephone小题3:The chairs should be put _______.

A．with the desks

B．before the winner

C．all over the room

D．in a line小题4:When the music starts,the players must _______.

A．run about the room

B．get down

C．walk around the chairs

D．sit on the chairs小题5:Which of the following statements is NOT true？

A．The game “Musical Chairs” is not difficult to learn.

B．The last one can sit on the last chair.

C．The winner can sit on the chair.

D．If the person plays music,he cannot be the winner.

现在认为下列哪项不可能引起溃疡性结肠炎

A．结肠的感染

B．变态反应

C．细胞免疫异常

D．遗传

E．过敏反应

A、B、C、D为初中化学常见的化合物，它们是由H、C、O、Na、Cl、Ca中的两种或三种元素组成，相对分子质量均小于100。   

（1）取少量A的无色溶液，滴加石蕊试液，溶液呈蓝色。A的水溶液呈____性。   

（2）向上述溶液中通入少量的气体B，无浑浊现象,且反应后溶液仍为蓝色。   

（3）向（2）所得溶液中加入一定量C的溶液，出现浑浊现象。过滤后，滤液仍为蓝色。由此推断，A物质是_______（写化学式），产生浑浊现象的原因是__________（用化学方程式表示）。   

（4）向滤液中加入D溶液，有气泡产生，溶液变为红色。有关的化学方程式为_____________________；最后得到的溶液中的溶质是______(指示剂除外)。

临床上以下列哪种前列腺炎最常见（）

A.急性细菌性前列腺炎

B.慢性细菌性前列腺炎

C.慢性非细菌性前列腺炎

D.无症状的炎症前列腺炎

E.前列腺痛

YDN-80系列耐震电接点压力表的测量范围为（）兆帕。

A、0～15

B、0～26

C、0～80

D、0～100