شرکت در آزمون آنلاین انگلیسی 3 - انگلیسی 3 | آزمون شماره 12061

He wanted to have a source of income after his retirement; until then, he wouldn’t ......... additional money.

The question whether everything on the moon’s surface is absolutely ......... is as yet an open one.

I would like to bring this problem to your … that the students are not doing well in their exams and you have to do something about it as a … teacher.

PART C: Reading Comprehension

Directions: Read the following passage and answer the questions by choosing the best choice (١), (٢), (٣), or (٤). Then mark the correct choice on your answer sheet.

GalaXies are the major building blocks of the universe. A galaXy is a big family of many millions of stars, and it is held together by its own gravitational field. There are two main types of galaXies; spiral and elliptical.

The Milky Way is a spiral galaXy: a flattish disc of stars with two spiral arms coming out from its center. About one_quarter of all galaXies have this shape. Spiral galaXies are well supplied with the interstellar gas in which new stars form; as the rotating spiral pattern goes around the galaXy, it compresses gas and dust, and forms young stars.

The elliptical galaXies have a symmetrical elliptical or spheroidal shape with no obvious structure. Most of their member stars are very old and since ellipticals are empty of interstellar gas, no new stars are forming in them. The biggest and brightest galaXies in the universe are ellipticals with masses of about ١٠١٣ times greater than that of the Sun; these giants may frequently be sources of strong radio emission, in which case they are called radio galaXies. About two_thirds of all galaXies are elliptical.

According to the passage, a galaXy is … .