Bộ ôn tập Từ cùng trường nghĩa môn Tiếng anh có đáp án (Part 2)
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Some scientists believe that there is about ten times as much substance/matter in the universe as astronomers have observed.

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Circle the word which best fits the sentence.

Some scientists believe that there is about ten times as much substance/matter in the universe as astronomers have observed.

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Giải thích

matter