Read the following passage and choose the best answer (A, B, C, D):
Poor Pluto! Once the ninth planet in our solar system, Pluto has now been demoted to the status of a "dwarf planet". It is no longer even part of our solar system, but rather of a separate area called the Kuiper Belt. The decision came about after the International Astronomical Union (IAU) tried to shed some light on Pluto's status. It came up with a new definition for planets that Pluto did not fit. Many in the astronomical disagreed with it, especially since the Earth, Mars, Jupiter and Neptune would not be planets either according to this definition! Only five percent of the astronomical community voted on this issue, and critics say this decision was not based on the community as a whole. In the state of New Mexico, a resolution has been passed that Pluto will always be a planet. This was done in honor of Clyde Tombaugh who discovered Pluto and lived most of his life in New Mexico. Pluto's demotion was also influenced by its size - it's only half the size of our moon! It consists of rock and ice. Pluto has one big moon (Charon) an two smaller ones (Nix and Hydra). Lowell realized that there must be a ninth planet as the gravitational pull of a large body was influencing the orbit of Uranus. He called it "Planet X". He spent his whole life searching for "Planet X" but to no avail. It was until 1930 that it was discovered by Clyde Tombaugh. Now that "Planet X" has finally been discovered, it needed a name. Suggestions poured in from all over the world, but it was an 11 -year-old girl. Venetia Burnet, who came up with the name "Pluto". Venetia was interested in Greek history, and "Pluto", was another name for Hades, god of the Underworld (Hell). As she imagined it to be a cold and dark place, she felt that "Pluto" would be an appropriate name. The Lowe Observatory (where Clyde Tombaugh worked) agreed and Pluto was born! Pluto is so far away from Earth that it is difficult to study. That will change in 2015 when the "New Horizons" spacecraft arrives on Pluto. It was launched on January 19.2006. It carries with it the ashes of Clyde Tombaugh Pluto's discover who died in 1997. It is hoped that the mission will give scientists more information about Pluto. Even though Pluto has lost its place in the sun, it is still important enough for scientists to study!
10. What does the word "this" refers to?
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Lời giải:
Báo saiGiải thích: Dựa vào nghĩa đoạn văn chọn B
Tạm dịch: quyết định nói là sao Diêm Vương sẽ luôn là một hành tinh