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mankind explore space? Why should money, time and effort be spent exploring and researching something with so few apparent benefits? Why should resources be spent on space rather than on conditions and people on Earth? These are questions that, understandably, are very often asked.
Perhaps the best answer lies in our genetic makeup(基因构成) as human beings.What drove our ancestors to move from the trees into the plains,
The wider the spread of a species, the better its chance of survival. Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible. Nearly every successful civilization has explored, because by doing so, any dangers in surrounding areas can be identified and prepared for. Without knowledge, we may be completely destroyed by the danger. With knowledge, we can lessen its effects.
Exploration also allows minerals and other potential(潜在的) resources to be found.Even if we have no immediate need of them, haps be useful later. Resources may be more than physical possessions. Knowledge or techniques have been acquired through exploration.The techniques may have medical applications which can improve the length or quality of our lives.We have already benefited from other spinoffs including improvements in earthquake prediction, in satellites for weather forecasting and in communications systems. Even non璼tick pans and mirrored sunglasses are by璸roducts ra(副产品) of technological developments in the space.rse was formed or how it works, it also holds dangers. The danger exists, but knowledge can help human being to survive. Without the ability to reach out across space, the chance to save ourselves might not exist.
While Earth is the only planet known to support life, surely the adaptive ability of humans would allow us to live on other planets. It is true that the lifestyle would be different, but human life and cultures have adapted in the past and surely could in the future.
解题导语：为什么要花这么多人力、物力在探索太空上？作者在文中解答了这个问题。tion the questions in Paragraph 1?
A．To express his doubts.
B．To introduce points for discussion.
C．To compare different ideas.
D．To describe the conditions on Earth.
解析：推理判断题。文章是典型的议论说明文按提出问题—分析问题的结构行文。第一段通过提出一系列关于太空探索的问题引出中心。s are natureborn to do so.
B．Humans have the tendency to fight.
C．Humans may find new sources of food.
D．Humans don't like to stay in the same place.
解析：细节理解题。根据“Perhaps the best answer lies in our genetic makeup as human beings.”和“Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible.”可知选A。________．chances
B．potential resources
C．unexpected benefits
D．physical possessions
解析：词义猜测题。根据后面的“including improvements in earthquake prediction的prediction, 等可知应选unexpected benefits。pace exploration.
解析：细节理解题。根据最后一段“While earth is the only planet known to support life, s to live on other planets.”可知选B。nology.
D．Space exploration may help us avoid potential problems on Earth.
解析：主旨归纳题。文章主要说明了太空探索可以帮助避免很多潜在的危险的发生。________ (draw) 100 million users.By September，2017, it 7.________ (reach) the 200 million mark, Tencent said.
The number of people 8.________ (use) WeChat, a voicemessaging service developed by the Internet giant Tencent Holdings, has hit 300 million in the less than two years 9.________ the service was released, the Shenzhenbased company said on Wednesday.
“The 300 million number is 10.________ milestone for WeChat, and we hope the service will be ready to perform 11.________ the global stage in 2017，” Pony Ma, Tencent chairman and chief executive officer, said on his microblog on Wednesday morning.
The function of WeChat is very similar to the text messaging and voice call services12.________are provided by telecom carriers.Late last year saw the13.________(introduce) of an English version of WeChat in a bid to draw more international users.Tencent has released versions in Arabic, Italian, Vietnamese, Japanese and Thai.
Tencent said it is 14.________(most) pursuing its expansion plans in emerging and Asian markets.It said the company finds15.________easier to reach its goals in such places, in part because they have cultures that are similar to China's.
解题导语：本文主要介绍了微信的建立、发展及前景。解析：固定结构take sometime to do sth.。答案：to draw解析：在句中作谓语根据“By September可知用过去完成时。答案：had reached解析：现在分词作定语表主动。答案：using解析：表“自……以来”用since。答案：since解析：一个里程碑。答案：a解析：“在全球性的舞台上”用on。答案：on解析：引导定语从句在从句中作主语。答案：that/which解析：根据前后的the可知此处用名词形式。答案：introduction解析：用副词修饰动词pursuing。答案：mostly解析：形式宾语真正的宾语为后面的不定式。答案：it