1. The expert estimated that the antiques were worth almost one million dollars.
A. indicated B. esteemed C. established D. evaluated
2. Most athletes agree that morale is an important factor in sports.
A. training B. luck C. strategy D. spirit
3. Hope of becoming a scientist is his incentive to work hard.
A. ability B. motive C. knowledge D. opportunity
4. We have a legal obligation to pay our taxes.
A. necessity B. position C. achievement D. responsibility
5. The conquest of outer space is a great triumph of modern science.
A. victory B. celebration C. satisfaction D. propaganda

参考答案
1-5. DDBDA