For instance , they are often polite _________tone formal in style.

单选题

For instance , they are often polite _________tone formal in style.

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单选题

In sub-Saharan Africa today, for instance, gross investment____for roughly of national income.

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单选题

We ___ people for doing what they know is wrong.

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单选题

They kept on walking for some time and then they stopped______ a rest.

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材料题

y to Rome for $752 less than it would otherwise, plus give you an extra one-and-a-half-hour flight to Milan?Airlines have increased their profitability in recent years by segmenting the market for air travel and charging customers different prices for the same product. In this case, the market is segmented based on demand for direct flights. Airlines know most people prefer the shortest route to their destination, so they make customers pay up for the privilege of flying direct. （They also make

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