单项选择题
A．they are twisted and stretched B．they are in their normal positions C．they are tested with a human "guinea pig" D．they are tested with electronic instruments
Why is it useful to carry enough 25-cent coins with you...
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.
When you post a letter, you must buy ______ .A．a ten-fe...
单项选择题When you post a letter, you must buy ______ .
We may conclude that （）A．India is larger than Antarctic...
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
