SpaceX and Tesla were in real danger. SpaceX's three launches had all failed and the company could afford only one more launch. But everything soon turned around. In September 2008, SpaceX launched its fourth rocket and it succeeded. It won a D|S1.6 billion contract with NASA. SpaceX was saved. Musk then shocked the investors and the tech world by pouring his entire personal savings into saving Tesla.

　　Despite his success, Musk's ambition has not gone away. He has also been working on other ambitious projects in recent years.

　　4．What do Musk's companies have in common?

　　A．They all gained an instant success.

　　B．Their goal is to offer affordable space travel.

　　C．Their development wasn't optimistic at first.

　　D．They had a revolutionary effect on their own fields.

　　解析：选D　推理判断题。根据第二段的内容，尤其是最后一句"All of them could be said to have turned their industries upside down"可知，Musk的公司在它们各自所属的领域产生了革命性的影响。

　　5．What do Bill Gates' words indicate?

　　A．There're many creative people.

　　B．Not everyone's dream can come true.

　　C．Successful people have a vision for the future.

　　D．Ability of practice accounts for Musk's success.

　　解析：选D　推理判断题。由第三段中Bill Gates所说的话，尤其是"What makes Elon special is his ability to make his vision come true"可推断，Bill Gates意在说明Musk成功的关键在于他的执行力。故选D。

　　6．Which words can best describe Musk?

　　A．Devoted and accessible.　 　B．Creative and determined.

　　C．Adventurous and aggressive. D．Ambitious and sympathetic.

　　解析：选C　推理判断题。根据第四段的最后一句"Musk then shocked the investors and the tech world by pouring his entire personal savings into saving Tesla"可以看出，Musk拥有敢于冒险的精神；根据第一段和最后一段的"ambition"可以看出Musk是具有上进心的，故选C。

　　7．Where may the passage be taken from?

　　A．Popular fiction. B．A biography.

C．A speech. D．A study.