单项选择题 Our challenge is to（）those voters and inspire them to join our cause.

单项选择题 Forests provides （）materials for human activities.

单项选择题 Retailers will need to rethink their strategies as（）shoppers demand price-competitive goods.

单项选择题 The National Institute of Health is discussing ways of tackling the problem of childhood（）.

单项选择题 To （）how the system works，Bruce shows off the prototype of a 3D analysis tool.