【单选题】Scarcity exists because
A.
society and people are greedy and wasteful.
B.
our wants exceed the resources available to satisfy them.
C.
of the inefficient choices we make.
D.
poor people need more food and other goods.
【简答题】下列有关主观判断法的说法正确的有( )。
【简答题】下列有关作业成本法的说法正确的有( )。
【单选题】Peter: ________ has he lived in China?Susan: He has lived here for two years.
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.