题目内容：
___________ life began on the earth is one of the biggest puzzles to scientists.（ ）
参考答案：
答案解析：
单选题：___________ life began on the earth is one of the biggest pu
- 题目分类：英语
- 题目类型：单选题
- 号外号外：注册会员即送体验阅读点！
--Let's throw a surprise party for mom's 50 birthday.--That'
--Let's throw a surprise party for mom's 50 birthday.--That's a good idea. We___
How did the man feel at the woman's words?（ ）
How did the man feel at the woman's words?（ ）
听材料，回答第题。In which year was the Nobel Prize first awarded?
听材料，回答第题。In which year was the Nobel Prize first awarded?
Who gave the man this piece of cloth?
Who gave the man this piece of cloth?
When I got New York, I had to attend a school for students__
When I got New York, I had to attend a school for students_______ first lan-guag