题目内容：
回答第43空。
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答案解析：
单选题：回答第43空。
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___________ life began on the earth is one of the biggest pu
___________ life began on the earth is one of the biggest puzzles to scientists.
--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?