The Sun will become a black dwarf when ___.
Đáp án B
“After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf”
Silent reading, especially in public places, flourished mainly because of ___.
Paragraph 4 of the passage serves mainly to do which of the following?
It can be inferred that the emergence of the mass media and specialised reading materials was an indication of ___.
Why did the author wait until the last line to reveal the identity of the man in the photograph?
According to the passage, many people’s understanding of desertification is incorrect because _____.
The word “degradation” in paragraph 4 is closet in meaning to _____.
Large amounts of gases may be released from the Sun at the end of its life as a .