题目内容：

    Does it make sense for countries to invest billions of dollars in space programs when millions of people in their country are living below the poverty line? Many people ask this question and I almost tire of answering it.

Let's talk about Duchenne Muscular Dystrophy (DMD) first. This is a terrible disease in which the victims progressively lose the ability to control their body. It affects almost only boys and shows itself when the boys are around age 5. They're wheelchair-bound by age 12, and will be dead before their 30th birthday. There is no cure. However, there are treatments. They're based on crystalline (晶体) protein structures, whose formation is adversely (不利地) affected by the presence of Earth's constant unidirectional (单一方向的) gravitational field. However, according to a study conducted by the Japan Aerospace Exploration Agency (JAXA) on the International Space Station (ISS), crystalline protein structures form regularly in microgravity conditions, which allows for targeted drugs designed to "double these boys' life spans (寿命)".

And you want to talk about feeding the hungry? We have space lettuce (生菜).And it's structurally and nutritionally equivalent to Earth lettuce. Space is pretty much everything there is, which means you can make a lot of lettuce in space. In fact, one of the potential growth markets in lunar colonization (月球殖民) is food trade. Food can be mass produced and sent to Earth to feed the hungry. By the way, as far as I am concerned, as for feeding the hungry, food distribution is the issue rather than food supply.

Space exploration is one of the best things that humanity has ever done.

1.What do people want to know by asking the question in Paragraph 1?

A.Whether there is a cure for DMD.

B.How many people live below the poverty line.

C.How much money is spent on space programs.

D.Whether space programs benefit people on Earth.

2.What can be learned about DMD?

A.It seems to spare girls.

B.Its cure lies in the ISS.

C.It gets serious in microgravity conditions.

D.Its patients need wheelchairs their entire life.

3.What is the author's attitude to growing food in space?

A.Doubtful. B.Positive.

C.Disapproving. D.Uncaring.

4.The text is most probably taken from a ________.

A.website to buy and sell the newest space products

B.website to ask questions and get quality answers

C.legal document

D.science fiction