问题 选择题

100克20%的氢氧化钠溶液中加入50克水和10克氢氧化钠后,其溶质的质量分数为(  )

A.15.7%

B.18.75%

C.20%

D.27.27%

答案

100克20%的氢氧化钠溶液中加入50克水和10克氢氧化钠后溶质的质量分数=

100g×20%+10g
100g+50g+10g
×100%=18.75%;

故选B.

阅读理解

A Day of Design

Sunday, June 17,2010

9 a. m. ~ 4 p. m.

Thomas College Student Center

Join us for a free day of fun! A Day of Design will encourage those interested in flowers and design to get in touch with their creative side and get some tips from the experts – Jeff and Scott. Pleas see the schedule below for details about this wonderful opportunity!

9:00 a.m. - 10:00 a.m.

Registration (登记) for the day runs from 9 a.m. in the Student Center. Later guests will take a tour of the Thomas College campus before the day’s events.

10:30 a. m. ~ 12:00 p. m.

Jeff and Scott will design more than a dozen arrangements in a variety of sizes and colors and auction (拍卖) will be held and guests will have the opportunity to bid on the flower arrangements.

12:00 p. m. ~ 1:00 p. m.

A delightful boxed lunch will be served. During the lunch hour, Jeff and Scott will create a centerpiece for the holiday table and give tips for creating a beautiful centerpiece using things found in the home.

3:00 p. m. ~ 4:00 p. m.

A fitting way to end the day – guests are invited to enjoy a wine and cheese party. Jeff and Scott will be available to answer questions or just talk about flowers!

There is no charge for this event.

REGISTER NOW!

Space is limited to 45 guests.

64.What are guests supposed to do from 9:00 a. m. to 10:30 a. m.?

A.To design flower arrangements.    

B.To enjoy a wine and cheese party.

C.To learn how to create a centerpiece.    

D.To take a tour of the Thomas College campus. 

65.When will an auction be held?

A.9:00 a.m. ~ 10:30 a.m.   B.10:30 a.m. ~ 12:00 p.m.

C.1:00 p.m. ~ 3:00 p. m.    D.3:00 p. m. ~ 4:00 p. m.

66.The underlined word “centerpiece” is probably         .

A.a photo on the wall                       B.a picture that has been drawn

C.a decoration for the center of a table           D.a flower that is carved out of stone

67.We can learn from the passage that A Day of Design         .

A.lasts for eight hours                      B.is free of charge

C.is held annually in July                    D.is aimed at fashion designers

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