单项选择题 Instead, there is a new business cycle, tied to the health of the high-tech sector. Riding a wave of technological optimism, the computer, software, and communications industries have grown at a pace far exceeding the rest of the economy over the past three years, helping to _____the expansion.

单项选择题 High-tech profits ______stock prices, making investors more willing to spend. And rising wages and bonuses for high-tech workers finance the purchases of new cars and homes.

单项选择题 Sometimes a bureaucrat’s ___ ruling can mean denial or loss of one’s welfare benefits.arbitraryC、 impersonalD、 objective