单项选择题
I bought an alarm clock with a(n) （）dial, which can be seen clearly in the dark.
A．supersonic B．luminous C．audible D．amplified
单项选择题 The music aroused an （）feeling of homesickness in him.
单项选择题 When supply exceeds demand for any product, prices are （）to fall.
单项选择题 The 1986 Challenger space-shuttle （）was caused by unusually low temperatures immediately before the launch.
