根据句子意思和所给的首字母写出所缺单词。 1. Oxygen (氧气) is a k

题目内容：

根据句子意思和所给的首字母写出所缺单词。 1. Oxygen (氧气) is a kind of u_______ gas.

2. The Yellow River is the s________ longest river in China.

3. I think it u________ to see the ghosts (鬼). You must be joking.

4. There are many a_______ who want to fly to the moon.

5. I felt surprised and scared when I saw the t________ monsters.

最佳答案：

1. useful 2. second 3. unbelievable 4. astronauts 5. terrible

答案解析：

该题暂无解析

考点核心：

根据最新人教版版和牛津版的初中英语教材的词汇量，一个水平较高的初中毕业生的词汇量应在2400左右。初中的单词和词组词汇量要求数量会不断增长。