单项选择题
During the construction of skyscrapers, cranes are used to （）building materials to the upper floors.
A．toss
B．tow
C．hoist
D．hurl
单项选择题 The ties that bind us together in common activity are so （）that they can disappear at any moment.
单项选择题 Bill is an example of a severely disabled person who has become （）at many survival skills.
单项选择题 The town planning commission said that their financial outlook for the next year was optimistic. They expect increased tax（）