Which of the following is an appropriate title for this passage?

A．Ready for a Round Trip to Mars

B．Ready for a Short Visit to Mars

C．Ready for a One-way Trip to Mars

D．Ready for a Walk on Mars

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参考答案

答案解析

【答案详解】主旨题。题干要求选出合适的题目。A选项意为，准备好了往返火星的旅程，根据文意可知，这是一趟单程旅行，故A选项错误；B选项意为，准备好了去火星的短暂旅程，由文意可知，单程去向火星的旅程不可能是短期，故B选项错误；D选项意为，准备好了在火星行走，根据文意，这是趟旅行，选项过于片面，故D选项错误；C选项意为，准备火星单程之旅，符合文意。故选C。
【高频词汇】
1．1and on降落，着陆 2．permanent永久的 3．take place发生；举行
4．subsequent随后的 5．settlement定居，移民，殖民
【难句解析】
This project，called Mars One，aims to send a small group of people to Mars in 2022 and eventually establish a permanent colony on the planet．
called Mars one为插入语，解释说明project。and前后为两个并列句，主语都为this pro-ject。句意为：这个项目被称为“火星一号”，目标是送一小批人在2022年登上火星，并最终在这个星球上建立一个永久殖民地。

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2 Students pay ____________ a day to leave their cell phones in a van parked near their school.

A．a dollars

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3 Metal detectors were installed in 88 city schools, mainly to keep ____________ out of schools.

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