6．登陸火星似乎只是個(gè)夢(mèng)想。

5．既然火星與地球完全不同，如果我們計(jì)劃有朝一日去火星的話，我們就要帶上氧氣、食品、衣服和住的地方。(shelter)

4．這樣我們就不能在那里生活了�！� (prevent...from)

3．人類對(duì)火星有了一些了解：火星上沒(méi)有氧氣，火星上中午的溫度可能在50度左右，而晚上則在零下100度左右了。(know a little about)

2．我們能否登陸火星完全取決于科學(xué)技術(shù)的發(fā)展。(depend on)

1．我們不知道火星上是否有生命。(whether，exist，life)

12．China is a ________ country，while America is a ________ country.(develop)

答案：1.energy　2.violence　3.independent　4.disappointment　5.presence　6.harm　7.lessen　8.cheerful　9.weightless　10.Exhausted　11.development　12.developing，developed

11．The ________ of this industry will take several years.(develop)

10．________ though she was，there was no hope of her being able to sleep.(exhaust )

9．It is known to all that man is ________ in space.(weight )