[2013·上海卷]38. An ecosystem consists of the living and nonliving things in an area ______ interact with one another.
A. th at B. where C. who D. what
[2013·浙江卷]13. The museum will open in the spring with an exhibition and a viewing platform _________ visitors can watch the big glasshouses being built.
A. what B. where C. when D. why
[2013·重庆卷]24John invited about 40 people to his wedding, most of ________ are family members.
A. them B. that C. whi ch D. w hom
