1. Researchers found that they could use microbial fingerprints to_____ the person who had used a computer keyboard even after the keyboard sat _____ for two weeks at room temperature.

A. identify, untouched                  B. recognize, touching

C. distinguish, untouched               D. acknowledge, touching

2. A new study ____the marmoset’s reputation for admirable community values. Researchers report that these caregivers share their food more generously with little ones in private than when they are surrounded by the watchful eyes of other community members.

A. shines           B. damages          C. affects          D. protects