单项选择题
A．He drives too fast. B．He plays his guitar too loudly. C．His radio wakes her children up. D．His friends are too noisy.
A．How to care for precious metals. B．A standard unit for measuring weight. C．The value of precious metals. D．Using the metric system.
A．Planes and motorcars have taken the place of trains. B．Oil is expensive today. C．Trains are slow. D．Railways lose money.