题目内容：

When Helly Scholten makes dinner, if she needs a tomato or an onion, she heads upstairs — the top floor of her house, a 440-square-foot indoor vegetable garden. She starts cooking before the sun goes down, while warmth is still flooding through the glass walls of the kitchen downstairs. The entire home is wrapped in a greenhouse.

In Rotterdam, the second-largest city in the Netherlands, such house is part of an experiment called Concept House Village, created to push the limits of sustainable (可持续的) design. It is an attempt to take things in different directions, experimenting with more radical features (特征).

Down the street, in the middle of a mostly empty field, another house tests features of an energy-producing toilet that uses waste. Another house, built from renewable materials, is designed to be constructed in a day.

Inside each of the three houses, volunteer families promised to live there for three years while giving feedback on the designs.

“Of course, it’s a test,” says Scholten. “We knew in advance that everything was not going to be perfect right away.” A rainwater-harvesting system on the roof, which was designed to directly water the vegetables growing in the loft, hasn’t been working correctly, so the family spends at least an hour a day watering the plants by hand. The parts of the house directly under the greenhouse walls can overheat, while the rest of the house can be cold in the winter. The current solar hot waters aren’t enough to keep showers comfortable.

When these new challenges arise, a team of students and professors from the University of Rotterdam — who originally designed and built the home — come over, continually tweaking the design to solve the problems.

Sustainable architecture is not unusual in Rotterdam. Next to the Concept House Village test site, another planned development of 170 homes will be completely energy-neutral — meaning, at the end of each year, the homes will have produced as much power as they used. By 2020, all new houses in the Netherlands will have to be carbon-neutral, by law.

Rotterdam is becoming a sustainable design capital, home to dozens of experimental projects. Next year, the world’s first floating dairy farm will open in a local harbor. The city is testing one-of-a-kind recycled bike paths and climate-proof parks; the port will soon start filtering(过滤) plastic waste from the harbor. Local businessmen are experimenting with mushroom farming, bread recycling, and turning food waste into leather.

1.What do we know about Concept House Village?

A. It is built based on sustainable concepts.

B. It fixes an indoor vegetable garden on each house.

C. It uses renewable materials to build toilets for its villagers.

D. Its buildings are completely different from traditional ones.

2.According to Helly Scholten’s words in Paragraph 5, her attitude towards the greenhouse can be described as _____.

A. cautious    B. reserved

C. uninterested    D. objective

3.What can we learn from the passage?

A. Volunteer families were required to live in the house for at most three years.

B. The home was not so satisfactory because it was designed and built by some college students.

C. Rotterdam has started filtering plastic waste from the harbor.

D. It is easy for people to find sustainable architecture in Rotterdam.

4.What’s the passage mainly about?

A. Ways to build sustainable buildings.

B. New greenhouses in the Netherlands.

C. An experimental city in the Netherlands.

D. The importance of Concept House Village.