Though you've got a tight schedule these days, I should be ________ if you could spare time to attend our meeting today.

A．concerned

B．fascinated

C．grateful

D．determined

人个防护是把人体与意外释放能量或危险物质隔开，是一种不得已的隔离措施，但却是保护人身安全的最后一道防线。