题目内容：

    Clouds are an ordinary sight. However, this Dutch artist makes his own.

Berndnaut Smilde creates clouds in locations where nature would never place them. The interior (内部) of a church or museum looks different behind a cloud. And an everyday cloud looks unusual in a castle. The art project explores the beauty of clouds. Each scene lasts only five seconds before it disappears.

The ingredients (成分) for Smilde's clouds: just smoke and water vapor (水蒸气). The artist requires a cold and wet space with no wind. Otherwise the clouds will never form or will fall straight to the ground.

Once a cloud is formed, Smilde will run around it and turn it into a shape about three meters across and 1.8 meters tall. Then, he will step back far enough to take several pictures. Smilde will not stop until he is happy with the results. Usually, he creates a dozen clouds at a time.

Many people are interested in Smilde's project. Some ask him to create clouds for them at a party or a wedding ceremony. Smilde, however, often refuses the invitations. He says he only creates clouds when the setting (背景) offers him something fresh. The artist doesn't just want people to stare in wonder at his clouds. He also wants people to appreciate the transience of life. For the clouds, they exist only for a moment and then are gone forever.

Each creation is "about being at the right place at the right time," Smilde says. "If you are seeing a photo, you have already missed it."

1.The ingredients for Berndnaut Smilde's clouds include _______.

A.soap and paint B.smoke and water vapor

C.soap and smoke D.paint and water vapor

2.In what order does Smilde carry out his art project?

a. Form a cloud                        

b. Take pictures

c. Turn the cloud into a special shape        

d. Look for a cold and wet space with no wind

A.a-b-d-c B.a-d-b-c C.d-a-b-c D.d-a-c-b

3.Smilde often refuses the invitations when people ask him to create clouds for them because _______.

A.the settings they offer cannot provide him with something fresh

B.they are not willing to pay him lots of money for creating clouds

C.the settings they offer are not big enough for him to create clouds

D.the places they offer are not cold or wet enough for him to create clouds

4.The underlined word "transience" in paragraph 5 probably means"_______".

A.the quality of being pure B.the quality of being large

C.the quality of being long-lived D.the quality of being short-lived

5.What's the best title of this passage?

A.An Engineer B.A Scientist C.Creating Clouds D.Creating Pictures