题目内容：

Every morning after breakfast, Wilbur walked out to the road with Fern and waited with her till the bus came. She would wave good-bye to him, and he would stand and watch the bus until it vanished around a turn. While Fern was in school, Wilbur was shut up inside his yard. But as soon as she got home in the afternoon, she would take him out and he would follow her around the place. If she went into the house, Wilbur went, too. If she went upstairs, Wilbur would wait at the bottom step until she came down again. If she took her doll for a walk in the doll carriage, Wilbur followed along. Sometimes, on these journeys, Wilbur would get tired, and Fern would pick him up and put him in the carriage alongside the doll. He liked this. And if he was very tired, he would close his eyes and go to sleep under the doll's blanket. He looked cute when his eyes were closed, because his lashes were so long. The doll would close her eyes, too, and Fern would wheel the carriage very slowly and smoothly so as not to wake her infants.

One warm afternoon, Fern and Avery put on bathing suits and went down to the brook for a swim. Wilbur tagged along at Fern's heels. When she waded into the brook, Wilbur waded in with her. He found the water quite cold--too cold for his liking. So while the children swam and played and splashed water at each other, Wilbur amused himself in the mud along the edge of the brook, where it was warm and moist and delightfully sticky and oozy.

Every day was a happy day, and every night was peaceful.

Wilbur was what farmers call a spring pig, which simply means that he was born in springtime. When he was five weeks old, Mr. Arable said he was now big enough to sell, and would have to be sold. Fern broke down and wept. But her father was firm about it. Wilbur's appetite had increased; he was beginning to eat scraps of food in addition to milk. Mr. Arable was not willing to provide for him any longer. He had already sold Wilbur's ten brothers and sisters.

"He's got to go, Fern," he said. "You have had your fun raising a baby pig, but Wilbur is not a baby any longer and he has got to be sold."

—taken from Charlotte’s Web

1.What does “this” in Paragraph 1 refers to(指代)?

A.The carriage

B.The doll

C.When Wilbur got tired, Fern would put him in the carriage alongside the doll

D.If Wilbur was very tired, he would close his eyes and go to sleep under the doll's blanket

2.According to the passage, the underlined sentience “Wilbur tagged along at Fern's heels.”in Paragraph 2 means________.

A.Wilbur went somewhere with Fern

B.Wilbur happened to meet Fern

C.Wilbur agreed to follow Fern

D.Wilbur couldn’t live without Fern

3.According to the passage, we can infer    (推断)________.

A.Fern was good at looking after infants

B.Fern would make efforts to stop Wilbur from being sold

C.Fern didn't get along well with Mr. Arable because he would sell Wilbur

D.Mr. Arable would sell Wilbur because Fern always had fun raising Wilbur