题目内容：

    Astronauts on board the International Space Station (ISS) once made history by taking bites of red romaine lettuce (长叶药昔）. They became the first humans to eat food that was grown entirely in space.

The lettuce was planted on the ISS in a small greenhouse called “Veggie”, which uses LED lights to help plants grow in space.

First, the astronauts cleaned the lettuce with special sanitizing wipes(消毒纸巾） and then ate it with some salad dressing.

“It was one small bite for man, one giant leap (飞跃）for ...our journey to Mars.”one astronaut, Scott Kelly, later posted on social media.

Space vegetables are a part of the NASA experiment called “Veg-01”, a study on how plants grow without the effects of Earth’s gravity（重力）. It will allow astronauts to grow and eat their own food during long space explorations.

“If we’re ever going to go to Mars someday, we're going to need a spacecraft that is much more self-sustainable in its food supply(供应）”, said Kelly.

Growing fresh plants on a spacecraft may also provide oxygen and help keep astronauts alive, NASA said.

Veg-o1 started in May 2014.The first batch(一批）of vegetables took 33 days to grow in space before they were taken back to Earth for a safety check. After making sure they were safe to eat, astronauts planted a second batch on July 8. They let the plant grow for another 33 days and were then able to eat it.

Astronauts usually only get vegetables when a supply ship comes to the ISS. Now with vegetables grown in space, they can eat them whenever they want.

1.Astronauts made history by________.

A.working on the ISS B.eating space-grown lettuce

C.cooking real food in space D.building a small greenhouse.

2.What is Veg-01?

A.It is the name of the greenhouse on the ISS.

B.It is a NASA project for exploring Mars.

C.It is a NASA experiment growing plants in space.

D.It s a NASA experiment on providing oxygen in space.

3.According to Kelly, why is growing fresh plants in space important?

A.Because it provides people with healthier food.

B.Because it can help astronauts with their journey to Mars.

C.Because it provides astronauts with enough oxygen.

D.Because it cuts the cost of delivering food to the ISS.

4.What does the underlined word “self-sustainable” mean in Chinese?

A.独自生长的 B.自我完善的 C.自我延续 D.自给自足的

5.What is the main idea of the story?

A.The success of growing vegetables in space. B.What food astronauts eat in space.

C.How astronauts get food in space. D.Astronauts’ work and life on the ISS.