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Three Chinese astronauts from the Shenzhou-13 manned spaceship returned to the Earth after completing their six-month mission. One of their major goals was to prepare the station for future groups of taikonauts（中国航天员）who will complete theassemblyof the space station.

Thanks to a new quick return procedure carried out for the first time, Shenzhou-13’s return trip lasted about nine hours rather than the 24-hour trip for Shenzhou-12, with the return capsule only circling the Earth five times before entering its final return orbit instead of 11 times as in past missions.

The Shenzhou-13 crew was responsible for taking out some of the science instruments to be used for experiments on the station. They also performed two spacewalks, conducted more than 20 different science experiments in addition to delivering two live educational lectures.

Taikonaut Wang Yaping, who gave the first public class from the Tiangong-1 space station, gave two such classes on this trip to Tiangong-2, which were viewed by millions of school children in China.

In addition, the taikonauts were sent questions from 20 schools in 13 U.S. states by American school children. The pre-recorded questions and responses were shared with students, parents and teachers at a “My Questions to Taikonauts” event on April 9 sponsored by the Chinese Embassy in Washington, D.C.

This was the first six-month mission, which will give those on the ground the opportunity to study the effects of the longer duration mission on the taikonauts, especially on the ageing process. The six-month stay will be common for astronauts in the future.

Visiting the Wenchang Space Launch Center on April 15, Chinese President Xi Jinping said that the facility serves China’s new-generation, heavy-lift carrier（运载）rockets and plays a significant role in the country’s deep-space exploration. The Chinese President called for efforts to achieve “world-leading standards” for China’s spacecraft launch facilities.

1．What does the underlined word “assembly” probably mean?

A．Building.

B．Discovery.

C．Invention.

D．Imagination.

2．What is the improvement of Shenzhou-13’s return trip before entering its final return orbit?

A．It lasted about nine hours with the return capsule circling the Earth eleven times

B．It lasted about 24 hours with the return capsule circling the Earth eleven times.

C．It lasted about nine hours with the return capsule circling the Earth five times.

D．It lasted about 24 hours with the return capsule circling the Earth five times.

3．Shenzhou-13 astronauts did the following except ________.

A．delivered two live educational lectures

B．studied the effects of ageing process

C．answered questions from American children

D．conducted many different science experiments

4．What can we infer from the last paragraph?

A．The Chinese President Xi Jinping visited Taiyuan Space Launch Center.

B．China’s spacecraft launch facilities have become “world-leading standard”.

C．The six-month stay will be common for astronauts in the future.

D．The facility is important for the country’s deep-space exploration.

5．Which of the following is the best title for this passage?

A．The Online Lectures in Shenzhou-13	B．The Return of Shenzhou-13 to the Earth
C．The Lives of Shenzhou-13 Astronauts in Space	D．The World-leading Spacecraft: Shenzhou-13