You are walking down the street, minding your own business when you see a snowball. No big deal, right? Except the snowball is as tall as you are. And weighs about a ton. Did we mention that it is June?
That’s the experience thousand of Londoners had when they crossed paths with “ Snowball in Summer,” Goldsworthy makes sculpture （雕塑）from all sorts of things he finds outside – leaves, earth, and rocks, as well as ice and snow. He wanted to find out how busy people would react to an unexpected snowball melting in their midst.
During the winter of 2008, he rolled 13 giant snowballs near his home in Scotland. He filled each one with a surprise in the center – such as berries, feathers, little stones or sheep’s wool – which would appear as the snow melted. The finished snowballs were stored in a deep freeze until summer, then transported to London in refrigerated trucks. At midnight on June 21, 2008, while the city slept, Goldsworthy and his helpers rolled their snowballs into place.
People walking to work or school must have thought the sky was falling when they stumbled across snowballs the size of baby elephants. Some of them had never even seen snow in real life, and they couldn’t help touching them in great surprise. As the snow started to melt, things got even more interesting. The perfectly round snowballs took on different shapes as the stuff inside began to poke through. Two days later, most of Goldsworthy’s snowballs were gone, and their fillings scattered. But Londoners were left with a really good story about that odd summer day when the snowball came.
What is really special about the snowballs is that ______________________.

A．they lie in the street

B．they are in the shape of baby elephants.

C．they have berries, feathers, little stones and feathers in them.

D．they appear in June.

What was the purpose of Goldsworthy in making the snowballs?

A．To find out people’s reactions to them

B．To call up people’s memory of the cold winter.

C．To show off his skills in sculpture.

D．To let people experience the cold winter.

Why did Goldsworthy and his helpers roll their snowballs into place at mid-night?
A. They didn’t want to disturb other people.
B. It was quite at that time.
C. They wanted to avoid the traffic jam.
D, They wanted to give people a surprise.