The purpose of the experiment introduced in the last paragraph is______.
A.to prove that the chimps are not self-recognitive
B.to prove that the chimps have the ability to remember their own appearance
C.to prove that the chimps have realized that the figures they see in the mirror are themselves
D.to prove that the chimps are non-human
______ is the proof for the quality , weight(quantity) or packing etc. of the goods delivered by the seller that they are ______ the contract.
______ is the proof for the quality, weight (quantity) or packing etc. of the goods delivered by the seller that they are in accordance with the contract.
The author mentions the ports of Los Angeles and Long Beach to ______.
[A]prove they are the largest ports in the United States
[B]demonstrate they create many new job opportunities
[C]highlight that shipping is less glamorous than making movies
[D]emphasize the role of shipping in southern California's economy
A.agree
B.acknowledge
C.receive
D.accept
Why are Amold Schwarzenegger and Garth Brooks mentioned in Paragraph 5?
[A] To prove their popularity around the world.
[B] To reveal the public’s fear of immigrants.
[C] To give examples of successful immigrants.
[D] To show the powerful influence of American culture.
Which opinion did the discovery prove?
A.Modem birds are the closest living relatives of the two-legged dinosaurs.
B.Dinosaurs have medullary bone.
C.Medullary bone is only known in ovulating birds.
D.Medullary bone is a source of calcium for birds to make shells for their eggs.
A.made
B.taken
C.gotten
D.given
The purpose of doctors holding laughter clinics is ______.
A.to give better condition to their patients
B.to improve patients' health
C.to make patients smile
D.to prove smile and laughter have the same effect
The free-rider problem arises because______.
A.private goods are not correctly priced in the market place
B.it is possible for an individual to consume public goods without him paying for them
C.the cost of producing public goods is too high
D.private goods may also be public goods
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