B
Many areas of cropland in Bangladesh(孟加拉国) are becoming unfit for farming. The land is becoming salty. It is a big problem for the small country. More than 155 million people live in Bangladesh. Growing crops is the most common way Bangladeshis support themselves.
Farmers in the country are learning to grow vegetables in so-called "vertical gardens." The soil in these gardens is better because heavy rains have removed much of the salt.
A vertical garden is easy to make. Villagers fill containers with good soil and natural fertilizers. They put the containers on bricks so they are off the ground. They add pieces of the bricks to the soil to help water flow and drain.
The farmers cut small holes into the sides of the containers. This permits vegetables with short roots a place to grow. Vegetables with long roots grow on top of the container. One bag of soil can produce up to eight kilograms of vegetables in one season.
Villagers also grow vegetables in containers made from large, thin pieces of plastic supported by bamboo. This "vertical tower" measures more than a meter wide. Each of these towers can produce more than 100 kilograms of vegetables. It costs about $12-$13 to build.
The village of Chandipur is in southwestern Bangladesh. Pumpkins and other gourds(葫芦) grow on vines on top of small homes. The vegetables get the food they need from soil placed in containers on the ground.
Shobitha Debna is a 35-year-old farmer in the village. Her garden space is very small. But she is able to grow hundreds of kilograms of vegetables each season.
She says she grows gourds, including pumpkin, as well as green beans, red amaranth, beets, carrots, cauliflower and more.
Ms. Debna depends on the vegetables to earn money. She makes a few dollars a day.
This kind of farming is new in Chandipur. But it may spread across the country.
The reason why cropland is becoming unfit for farming is that________.

A．the soil has been polluted

B．more and more land is used for planting trees

C．the land is becoming salty

D．there is too much rain

Why the soil in vertical gardens is better_______?

A．because there is much less salt in the soil

B．because there is much salt in the soil

C．because there is enough water in the soil

D．because there is many nutrients in the soil

From paragraph 4, we can learn that_______?

A．vegetables with long roots grow in the sides of the containers

B．vegetables with short roots grow out of the small holes in the sides of the containers

C．vegetables with short roots grow on top of the container

D．vegetables in vertical gardens are not productive

Ms. Debna grows many kinds of vegetables EXCEPT________.

A．gourds

B．carrots

C．pumpkins

D．cucumbers

What can we infer from the passage__________?

A．Many areas of cropland in Bangladesh(孟加拉国) are becoming unfit for farming

B．155 million people in Bangladesh are short of food

C．This kind of farming may spread across Bangladesh

D．Ms. Debna earns a lot of money through selling vegetables