人類的探險活動已經(jīng)由地球走向了太空。對于太空探險，不同人有不同的看法：有些人認為可以獲得新的知識和資源，同時也可進一步擴大人類的生存空間；另外有些人認為太空探險活動耗資巨大，而且宇航員的安全也是問題。

請根據(jù)以上內(nèi)容寫一篇120～150詞的短文，談?wù)勀銈�人的看法。

注意：標(biāo)題與開頭已寫好，不計入總詞數(shù)。

Is it necessary to carry out outer space explorations?

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根據(jù)所給提示或提示詞所構(gòu)成短語的適當(dāng)形式完成句子。

81. The committee         some experts and three worker representatives. (consist)

82. I am going to          my writing for a while. (concentrate)

83. To put the plan into practice, you should      everything               . (考慮)

84. Even if you have good senses, you may be        (迷惑) by such pictures.

85. You can go              (代替) me, if you want.