[单项选择]The primary reason for withholding food and fluids from a client who will receive general anesthesia is to help prevent（）
A. constipation during the immediate postoperative period.
B. vomiting and possible aspiration of vomitus during surgery.
C. pressure on the diaphragm with poor lung expansion during surgery.
D. gas pains and distention during the immediate postoperative period.

[填空题]What is the primary reason for many people in the 18th century to try hard to "control" the English language

[填空题]______ is the primary reason for the high costs of medical expenses of the aged people.

[单项选择]The reason much refrigerated food spoils is that it ends up out of sight at the back of the shelf. So why not have round shelves that rotate Because such rotating shelves would have just the same sort of drawback, since things would fall off the shelves’ edges into the rear corners.
Which of the following is presupposed in the argument against introducing rotating shelves
A. Refrigerators would not be made so that their interior space is cylindrical.
B. Refrigerators would not be made to have a window in front for easy viewing of their contents without opening the door.
C. The problem of spoilage of refrigerated food is not amenable to any solution based on design changes.
D. Refrigerators are so well designed that there are bound to be drawbacks to any design change.
E. (E) Rotating shelves would be designed to rotate only while the refrigerator door was open.

[填空题]The main reason for high food prices is ______ in some rice-growing nations.

[填空题]primary

[简答题]
A few months ago I booked a flight for two and then went to select seats on the airline’s site. Based on the destination and time of year, I was surprised to find only two adjacent seats were available without paying a premium (额外费用). But I was even more surprised a few weeks later, when we boarded the aircraft and a flight attendant announced that only 30% of seats were occupied, so we should all feel free to stretch out.
So how could a flight that looked nearly full a month earlier wind up with seven out of ten seats empty That’s a question only the airlines can answer, and they’re not eager to provide many details.
Are some carriers intentionally holding back seat assignments, in the hope we’ll all pay for "premium" seats It’s a fair question, and the evidence is intriguing.
Behind the screen indeed
An awful lot goes on behind airline and travel bookin

[简答题]Primary markets

[单项选择]
A few months ago I booked a flight for two and then went to select seats on the airline’s site. Based on the destination and time of year, I was surprised to find only two adjacent seats were available without paying a premium (额外费用). But I was even more surprised a few weeks later, when we boarded the aircraft and a flight attendant announced that only 30% of seats were occupied, so we should all feel free to stretch out.
So how could a flight that looked nearly full a month earlier wind up with seven out of ten seats empty That’s a question only the airlines can answer, and they’re not eager to provide many details.
Are some carriers intentionally holding back seat assignments, in the hope we’ll all pay for "premium" seats It’s a fair question, and the evidence is intriguing.
Behind the screen indeed
An awful lot goes on behind airline and travel booking screens, an
A. they have to pay additional money to get the seats they want
B. they have to pay different prices based on the day of purchase
C. they are confused by the advance purchase patterns
D. there are too many combinations of fares offered by airlines