四级练习2012.08.13 thousands, 四级, interested, challenge, actually

Rebecca949

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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杨飞飞儿

1 challenges
2 ... many diseases
3 scientists must develop new forms of energy

zhant220

1. challenges
2. conquering of many diseases
3. scientists must develop new forms of energy

jkm204

challenges

conquering many diseases


scientists must develop  new forms of energy

r124532234

challenges
conquaring many diseases'
scientiests must new forms of energy