She looks sad. Could you please tell me ____ that prevents her from being as happy as before?

A. what it is     B. it is what       C. how it is        D. it is how

The website YouTube was created in 2005 and became an overnight success.Google bought YouTube for more than $1,600,000 the following year.In May,YouTube announced that two billion videos were watched each day.
In June,the Guggenheim Museum in New York City announced it would hold a competition among YouTube videos.Now,the judges have chosen the top 125 videos.
The Guggenheim and YouTube launched the competition called“YouTube Play.A Biennial(两年一度)of Creative Video.”The information technology companies HP and Intel are supporting the event.23,000 videos entered the competition.They represented 91 countries and every possible style of movie making.
The rules of the competition were few.Video makers had to be eighteen years or older.They could enter only one video.It had to be no more than ten minutes long.Any language,subject,sound,and style were considered.
Eleven people are judging the videos.They include artists,musicians,and filmmakers.Laurie Anderson is all three.She says all her art starts with a story,so she looks for a story as she judges the videos.
Other judges include the filmmaker Darren Aronofsky,the band Animal Collective,and artist and filmmaker,Shirin Neshat.
New Jersey artist Dahlia Elsayed’s video is one of the finalists.She used the camera in her computer to record herself describing her daily food desires for one month.The video is simple,short,and interesting.
A frightening,but beautiful video came from Chile.The video by Niles Atallah,Joaquin Cocina Varas.and Cristobal Leon is called“Luis”.It is an animated ghostly story of a tense,angry boy.It is very dark,but impossible to stop watching.
“Mars to Jupiter”is a video from Canada by Sterling Pache.It is about a survivor of the 1994 genocide(种族屠杀)in Rwanda.The video explores how her past still haunts(萦绕) her.
Other chosen videos are from France,Spain,Taiwan,Australia,and Israel.Almost thirty countries are represented.You can see them if you link to YouTube Play from our website at voaspecialenglish.com.
People can also see the 125 videos at the Guggenheim museums in New York；Bilbao,Spain;Berlin,Germany;and Venice,Italy.
On October 21,the YouTube Play judges will announce the final twenty winning videos at a special event at the Guggenheim in New York.The Videos will be on View there until October 24.
【小题1】Accoding to the text,YouTube might be       .

—She looks very happy.She_______have passed the exam.

—I guess so.It’s not difficult after all.

A.should                      B.could                        C.must                         D.might

C
There’re five people at our table, including myself. I’ve already learnt a great deal about them in the short time we’ve been at sea, although we rarely meet except at meal times.
First of all, there’s Dr Stone. He’s a man of about sixty five, with gray hair and a friendly face. He gave up his work a short while ago and is now traveling round the world before he retires to some quiet country village. As a young man, he served for many years as a doctor in the army and visited many countries. He’s told us a lot about the city to which we are going.
Then there’s “Grandmother”. I call her that because her name escapes me. In spite of being a grandmother, she looks rather young, not more than fifty, she’s on her way to visit a daughter who went to Australia some years ago. Naturally she is very excited at the thought of seeing her again, and her three grandchildren, whom she has never seen.
Then there’s a man I don’t care for very much, an engineer by the name of Barlow. He has been on leave in England and is now returning to his work in Singapore.
The other person who sits at our table is Mrs. Hunt. I’ve found out hardly anything about her. She’s extremely quiet and rarely talks, except to consult（咨询）the doctor about children’s various illness. She’s on her way to join her husband in India.
64. What can we know about Mr. Stone?
A. He is a doctor in the army now.
B. He is going to give up his work.
C. He knows a lot about the city the author is going to.
D. He has been retired for many years.
65. The writer calls the second person “Grandmother” because_______.
A. she looks old                                        B. She has three daughters
C. he respects her                                      D. he can’t think of her name
66. Which of the following is TRUE?
A. Dr Stone lives in a quiet village now.                B. “Grandmother” is an Australian.
C. Barlow works in Singapore                           D. Mrs Hunt is a woman of many words.

She looks sad. Could you please tell me ____ that prevents her from being as happy as before.

    A. what it is       B. it is what    C. how it is         D. it is how