单项选择题
A．Credit cards have more advantages than travellers’ cheques. B．Dollar bills are as convenient as credit cards. C．One-cent coins have been withdrawn from circulation. D．You can increase your credit limit as you lik
A．5 per cent of the world’s water B．15 percent of the world’s water C．20 percent of the world’s water D．50 percent of the world’s water
A．by B．in C．at D．on