Tour operators report low _____ rates.
                    举一反三
- Tour operators report low _____ rates.( ) A: occur B: occupancy C: occasion D: occurrence
 - ________ were characteristic of the UK economy in relation to other developed economies. A: Low rates of industrial investment B: Low rates of scientific experiment C: Low rates of educational investment D: Low rates of military expenditure
 - When tour operators lower their price, they may ______.
 - The tours offered by specialist tour operators are often the ____tours.
 - The world’s birth rates are on a decline and____are the death rates.
 
