[单项选择]

You don’t have to pay high prices for air travel any more. There are lots of alternatives to regular, full-priced plane tickets if you can plan far enough ahead. Here are a few of the options.
"No extra" airlines charge very low prices for most flights. These airlines offer the same services as other airlines, but you sometimes have to pay extra for them. For example, you may have to pay for any food or drinks you have on the plane, and you may have to pay extra if you check baggage instead of carrying it on the plane.
Seats on charter (包租) flights are usually sold as part of a package deal with hotel accommodations. You can get great prices on these charter flights, but occasionally you have to spend long hours waiting in airport because charter airlines often own only one or two planes, and one late flight means that all flights are late.
Regular airlines may offer special rates if you book your flights in advance and fly on certain days
A. recommend particular types of flight
B. describe the variety of flights available
C. illustrate the role of the travel agent
D. explain the differences between certain airlines

[单项选择]

You don’t have to pay high prices for air travel any more. There are lots of alternatives to regular, full-priced plane tickets if you can plan far enough ahead. Here are a few of the options.
"No extra" airlines charge very low prices for most flights. These airlines offer the same services as other airlines, but you sometimes have to pay extra for them. For example, you may have to pay for any food or drinks you have on the plane, and you may have to pay extra if you check baggage instead of carrying it on the plane.
Seats on charter (包租) flights are usually sold as part of a package deal with hotel accommodations. You can get great prices on these charter flights, but occasionally you have to spend long hours waiting in airport because charter airlines often own only one or two planes, and one late flight means that all flights are late.
Regular airlines may offer special rates if you book your flights in advance and fly on certain days
A. regular airlines
B. charter flights
C. "no extra" airlines
D. the full planes

[单项选择]You don’t have to pay high prices for air travel any more. There are lots of alternatives to regular, full-priced plane tickets if you can plan far enough ahead. Here are a few of the options.
"No extra" airlines charge very low prices for most flights. These airlines offer the same services as other airlines, but you sometimes have to pay extra for them. For example, you may have to pay for any food or drinks you have on the plane, and you may have to pay extra if you check baggage instead of carrying it on the plane.
Seats on charter (包租) flights are usually sold as part of a package deal with hotel accommodations. You can get great prices on these charter flights, but occasionally you have to spend long hours waiting in airport because charter airlines often own only one or two planes, and one late flight means that all flights are late.
Regular airlines may offer special rates if you book your flights in advance and fly on certain days of the week when they don’t exp
A. recommend particular types of flight
B. describe the variety of flights available
C. illustrate the role of the travel agent
D. explain the differences between certain airlines

[单项选择]High oil prices have not yet produced an economic shock among consuming countries, but further rises, especially sharp (21) , would undoubtedly hurt the world economy, and (22) would inevitably harm producers, too. Beyond this obvious point, (23) , higher prices could even do harm to both oil firms and producers.
Big oil firms (24) rolling in money today, but that disguises the fact that their longer-term prospects are (25) Behind the reserves-accounting scandal at Royal Dutch/ Shell (26) a problem bedeviling all of the majors: replacing their dwindling reserves. (27) existing fields in Alaska and the North Sea are rapidly declining; OPEC countries and Russia are (28) them out. (29) they are to survive in the long term, the big oil firms must embrace other sources of energy (30) oil.
(31) it is to believe, higher oil prices could be bad news for produc
A. For hard
B. As hard
C. Very hard
D. As hard as