JIUQUAN, China, Oct.16(Reuters)----China on Saturday launched a rocket     1     (carry) three astronauts --- two men and one woman---to the core module of a future space station     2     they will live and work of six months, the longest orbit for Chinese astronauts.

China began constructing the space station in April with the launch of Tianhe----the first and     3     (large) of the station’s three modules. Slightly bigger than a city bus, Tianhe will be the living quarters of the     4    （complete）space station.

Shenzhou-13 is the second of four crewed missions needed to complete the space station by the end of 2022. During the first crewed mission     5     concluded in September, three other astronauts stayed on Tianhe for 90 days.

“The most challenging task will be the long-term stay in orbit for six months,”Zhai Zhigang, 55, the mission commander, born to a rural family with six children, told a news conference on Thursday. “It asks for     6     (exact) higher demands (on us),     7     physically and psychologically.”

He     8     (accompany) by Wang Yaping and Ye Guangfu, both 41. Wang, also born to a rural family, is known     9     colleagues for her tenacity(坚韧）. The former air force pilot first travelled to space in 2013, to Tiangong-1, a prototype lab. She is China’s second female astronaut in space, following Liu Yang in 2012. Shenzhou-13 is the first space mission for the third astronaut, Ye.

    10     the crew returns to Earth in April, China plans to deploy six more missions, including deliveries of the second and third space station modules and two final crewed missions.

Darwin was fascinated     1     rocks, plants and animals, who began his journey     2     the Beagle. As he studied the samples which was     3     (crowd) with his room on the ship，he raised the question: how did different species come    4     (exist)？Although people believed that all species had appeared on Earth at the same time，Darwin wanted to look for     5     (evident) to prove it was not true. On the Galapagos Islands，he noticed the     6     (differ) between the finches，and it seemed their beaks     7     (evolve). Darwin suspected the finches had evolved from     8     (early) ancestors.    9     (eventual), he proposed a theory about evolution     10     living things had evolved from lower forms of life，and published his book，On the Origin of Species.

“Today, we mourn the passing of a true food hero. Chinese scientist Yuan Longping saved     1     (million) of people from hunger by     2     (develop) the first hybrid rice strains,” the UN Department of Economic and Social Affairs tweeted.

“He passed away today at 91 (due to illness) but his mission     3     (end) hunger will live on and his legacy     4     (remember) for generations,” it said.

Having spent over five decades in hybrid rice research, Yuan, an academician with the Chinese Academy of Engineering, has helped China work     5     great wonder-feeding nearly one fifth of the world's population with less than 9 percent of the world's total land.

Qu Dongyu, Director-General of the UN Food and Agriculture Organization, on Saturday expressed his sadness over Yuan's passing.

“I am     6    (deep) saddened by the death of Prof. Yuan Longping, my dear Master. He devoted his life     7     the research of hybrid rice, helping billions achieve food     8     (secure)," wrote Qu on his Twitter account.

Born in Beiing in 1930, Yuan     9    (succeed) in cultivating the world's first high-yield hybrid rice strain in 1973,     10     was later grown on a large scale in China and other countries to substantially raise output.