Chinese astronauts have successfully grown rice seedlings（幼苗）aboard the Tiangong space station and this experiment may offer key insights into how astronauts can grow food to support long—term space missions，experts said on Monday.This experiment is the first to produce the complete life cycle of the plant，which begins with a seed and ends with a mature plant producing new seeds.
The breakthrough was conducted in the Wentian space laboratory，which was launched into orbit on July 24，2022.Three astronauts were conducting the experiment smoothly and testing the plants according to the plan.
"The rice seedlings are growing very well，" said Zheng Huiqiong，a researcher of the task，adding that the experiment also contained seedlings of a small flowering plant often used by scientists to study mutations（變異）. "The astronauts will keep monitoring the plants，and if it is successful，they will collect the newly produced seeds and bring them back to Earth for further studies，" she noted.
The flowering stage is crucial for plant reproductive development. "We want to investigate how microgravity can affect the plant flowering time and whether it is possible to use the microgravity environment to control the related process，" she said.
Since the 1980s，China has been taking seeds of rice and other crops to space to help them mutate and produce higher yields once they were planted on Earth.But growing rice in orbit is a different challenge due to the tough conditions of space such as microgravity and lack of air.
Rice has been a main food for astronauts since the early days of space exploration.Freeze—dried chicken and rice was the menu for the Apollo 11 mission，which carried the first humans to land on the moon in July 1969.
"But if we want to land on and explore Mars，bringing food from Earth is not enough to provide for the astronauts' long journey and mission in space.We have to find a food source for long term space explorations，" Zheng added.
（1）What's the significance of Chinese recent space rice experiment？ DD
A．It enables human beings to move to another planet.
B．It helps people get a better idea of the human life cycle.
C．It inspires more other countries to do space explorations.
D．It makes it possible to carry out long—term space missions.
（2）What does the underlined word "it" in paragraph 3 refer to？ BB
A．The mutation.
B．The experiment.
C．The exploration.
D．The space mission.
（3）Why have crop seeds been brought to space since the last century？ AA
A．To promote genetic changes and increase crop harvest.
B．To figure out how to create an earth—like environment.
C．To study the impact of microgravity on crop growth.
D．To develop new crop species with strong ability to adapt.
（4）Where is the text most probably from？ CC
A．A medical report.
B．A fashion magazine.
C．A science newspaper.
D．A history book.
【答案】D；B；A；C
【解答】
【點評】
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發(fā)布：2024/5/27 14:0:0組卷：2引用：7難度：0.5
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