For thousands of years, people accepted challenges. Today we still have many (1)___________________ahead of us. Medical science faces the challenges of (2)____________________ which still attack human beings. Engineers and planners must build new cities and new kinds of transportation. (3)______________________________And many of us are interested in the challenge of space. We actually live in an age of challenge.
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作者: 杨飞飞儿 时间: 2012-8-14 14:14
1 challenges
2 ... many diseases
3 scientists must develop new forms of energy作者: zhant220 时间: 2012-8-14 14:29
1. challenges
2. conquering of many diseases
3. scientists must develop new forms of energy作者: jkm204 时间: 2012-8-14 18:55
challenges
conquering many diseases
scientists must develop new forms of energy作者: r124532234 时间: 2012-8-26 15:07
challenges
conquaring many diseases'
scientiests must new forms of energy
