题目选项分析

Using technology as new as space-age fabrics and as ordinary as common dry-cleaning chemicals, an attempt by scientists and historians to clean and preserve the American flag that flew over Fort McHenry in Baltimore in 1814 is being made in the hope that it will then last another 200 years.

Using technology as new as space-age fabrics and as ordinary as common dry-cleaning chemicals, scientists and historians are attempting to clean and preserve the American flag that flew over Fort McHenry in Baltimore in 1814, hoping that it will then last another 200 years.