阅读下列短文，并做每篇短文后面的题。从A、B、C、D四个选项中，选出能回答所提问题或能完成所给句子的最佳选项，并在答翘卡上将该项涂黑。
Sunshine For All
The Beijing Sunshine Secondary School students are holding a charity show at the school hall of Beijing Sunshine Secondary School, Sunny Street, Sunshine Town.
Date: 29 April
Time: 7:30 p. m.一9:00 p. m.
We hope to raise money to help poor children go to school.
Ticket price: $20
Donations are welcome.
Programme:
7:30 p. m. Introduction
7:40 p. m. Songs
8:00 p. m. Break
8:15 p. m. Speech
8:30 p. m. Drama
9:00 p. m. End of the show
Project Hope is an organization that raises money to build schools and buy books for poor students.
We would like to thank the following for their help and support:
? The teachers at Beijing Sunshine Secondary School
? The Star Shopping Mall for the costumes
? Sunshine Advertisement Company for the posters
41. Where will the charity show be held?
A. In the classroom.
B. In the meeting room.
C. In the shopping mall.
D. At the school hall.
42. When will the charity show be held?
A. 7:30 p. m.一9:00 p. m., 29 April.
B. 7:30 a. m.一9: 00 a. m., 29 April.
C. 7:30 a. m.一9: 00 p. m. 29 May.
D. 7:30 p. m.一9: 00 p. m. 29 May.
43. Why do they want to raise money?
A. To build schools.
B. To help poor children go to school.
C. To buy books for poor students.
D. To hold the charity show
44. What can you do at 8:00 p. m.?
A. Watch a drama. B. Enjoy songs.
C. Have a rest. D. Listen to a speech.
45. Whom do the students want to thank?
A. Sunshine Advertisement Company for the posters.
B. The Star Shopping Mall for the costumes.
C. The teacher at Beijing Sunshine Secondary School.
D. All of the above.
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盐酸、5%NaOH溶液、饱和
溶液、饱和
溶液和蒸馏水。
面在同一水平面上，最后读数时右管的液面高于左管的液面，应进行的操作是 
。