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I. 单项选择
1. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.
A. exposed B. threatened
C. constructed conserved
2. While watching television,__________.
A. the doorbell rang B. the doorbell rings
C. we heard the doorbell ring we heard the door bell rings
1. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.
A. exposed B. threatened
C. constructed conserved
2. While watching television,__________.
A. the doorbell rang B. the doorbell rings
C. we heard the doorbell ring we heard the door bell rings
