There are still many problems ahead of us, but by this time next year we can see light at
A. battle
B. day
C. road
D. tunnel
查看答案
The word them in the passage refers to
A. sea slugs.
B. discouraging results.
C. algae blades.
D. new colonies.
According to the passage, what are the opportunity costs of a product？
A. The amount of time and money spent in producing it.
B. The opportunities a person has to buy.
C. The value of what could have been produced instead.
D. The value of the resources used in its production.
The word tolerate in the passage is closest in meaning to
A. symbolize.
B. formulate.
C. withstand.
D. intensify.
Which of the following examples best reflects a cost to society as defined in the passage？
A family buying a dog.
B. Eating in a restaurant instead of at home.
C. Listing land for a house instead of a park.
D. Staying at home instead of going to school.
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