When you post a letter, you must buy （）.

单项选择题We may conclude that （）.

A．India is larger than Antarctica
B．The Indian Ocean is to the east of Australia
C．Madagascar is larger than Sri Lanka
D．The India Ocean is larger than the Atlantic

单项选择题Why is it useful to carry enough 25-cent coins with you （）

A．They can act as small change for the exact bus fares.
B．There is generally no problem in using them in Canada.
C．As a basic unit of money, they are gradually gaining in usage.
D．They may come in handy for pay phones or laundry machines.