1. Cement was seldom used in building the Middle Ages.
A. crudely
B. rarely
C. originally
D. occasionally
2. Medicine depends on other fields for basic information, particularly some of their specialized branches.
A. conventionally
B. obviously
C. especially
D. inevitably
3. We were astonished to hear that their football team had won the champion.
A. amazed
B. amounted
C. amused
D. approached
4. There is an abundant supply of cheap labor in this country.
A. a steady
B. a plentiful
C. an extra
D. a stable
5. The most crucial problem any economic system faces is how to use its scarce resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
答案：BCABD