○testlevel1○
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第1問目
以下の文では、最後の文が未完成です。段落の下にリストされている4つの選択肢から、適切な文を選択してください。
In a traditional children's song, a star is compared to a "diamond in the sky." Some scientists are now saying that there may be real diamonds among the stars of the universe. These diamonds are certainly interesting for the scientists. However, they are probably not going to make anyone rich, because .
they are too far away.

only children can see them.

they are too expensive.

only the scientists know where they are.



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