单项选择题
A．She was quiet and shy. B．She was bright and friendly. C．She was weak from illness. D．She was uncontrollabl
A．Fishes only "speak" to communicate with each other. B．Researches are now being made to study the significance of fish sounds. C．Sea animals have a sharper hearing ability than men. D．Sounds made by fish cannot be transmitted through the air.
A．the doctor belonged to that organization B．many people in Hong Kong also suffered from it C．the doctor found its virus and sent the samples to them D．it spread widely in Singapore for the first time