题目内容：

As the leaves change color in autumn, students return to school.As a frost covers the ground each night, we are busy planting vegetables in northern Wisconsin.

Five public school districts in northern Wisconsin recently built high tunnels (隧道) for the winter growing season.The schools’ high tunnels, made of metal frame and a plastic covering the raised beds, keep plants warm enough to extend the growing season through the winter and allow an earlier spring planting.Our very short growing season occurs almost entirely during the summer vacation months.This makes the high tunnels necessary in allowing students to gain experience of growing and marketing produce in a cold climate where production at this scale couldn’t otherwise happen during the school year.

During the summer, the high tunnels on school grounds still need to remain there.We developed the Agripreneur program(Agriculture + Entrepreneur) to support students’ work in the high tunnels during months when students are are on holidays.This program was made possible by a farm and a university.Each summer, a pair of students will be hired from every high school to care for and sell a single crop in exchange for instruction from professional lo-cal farmers, growing experience, and a salary.

The Agripreneur program appeared for its first season during the summer of 2015.Students grew tomatoes that were sold to community members, local restaurants and the school cafeterias（食堂）.The program met its goal of increasing the number of local vegetables consumed, both within the region and in school lunches.Sales to school cafeterias will continue through the winter as the high tunnels’ change to nutrient root vegetables, all grown by students.

We may live in winter, but with the recent addition of these school high tunnels, our students are able to eat the freshest local vegetables available—even during the coldest months.

1.What do we know about the school’s high tunnels?

A. They are actually greenhouses.

B. They are actually metal containers.

C. They are entirely used for planting vegetables in summer.

D. They are mainly used as reading rooms for students.

2.High tunnels are being used in the school districts because of ______.

A. students’ interest in planting.

B. the larger need of crops there.

C. the short growing season there.

D. no fresh vegetables available there.

3.The Agripreneur program was created to______.

A. get farmers to produce more crops.

B. check students’ work on the high tunnels.

C. get instructions from professional local farmers.

D. help students do their work in the high tunnels in holidays.

4.What can be the best title for the text?

A. Crops Are Planted in Winter

B. Students Are Becoming Scientists

C. Schools Have the Vegetable Market

D. New Growing Season Begins Under High Tunnels