单选题 Carnegie believed that individuals should progress through hard work (指向自己), ______ he also felt strongly that the wealthy 有钱人 should use their fortunes 财富 for the ______ of society (向外).

A、 however,+句子
B、 but
C、 as+句子因为/按照/随着
D、 because
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单选题 What does "And that makes sense" refer to in the first paragraph?

A、It is reasonable if you find the mice clever.
B、It is nonsense to find the mice become clever.
C、There is no evidence that the mice become clever.
D、The mice are unbelievably clever at finding food.

单选题 The results of the experiment indicate that ______.

A、the cleverer a mouse is, the better relationship it has with humans
B、the longer the mice live with humans, the better they are at finding food=solve these food puzzles
C、different varieties of mice have similar cognitive abilities
D、it is humans who train mice to be cleverer over the years

单选题 In Guenther's experiment ______.

A、mice had to put puzzle pieces together
B、mice needed to overcome obstacles 归纳
C、different mice groups were treated differently ≠ different food puzzle
D、worms were used to develop mice's skills 无

单选题 Which of the following is NOT one of the health benefits of carbohydrates?

A、Prevention of fiber reduction.
B、Prevention of heart disease.
C、Prevention of stroke.
D、Prevention of cancer.

单选题 What is the significance of the research on mice?

A、It contributes to the study of human influence on animals.
B、It helps humans to find better ways to get rid of mice.
C、It provides methods to protect various animal species-house mice.
D、It gives evidence to the understanding of animal minds.

单选题 As is used in Paragraph 1, the word "exhausted" most possibly means ______.

A、derived
B、deprived
C、startled
D、starving

单选题 Why does the author mention three groups of house mice?

A、To prove that the mice> a dozen subspecies of house mice are wide-spread.
B、To prove that the mice are incredibly clever. 混合组合,超出范围
C、To illustrate that each species of house mice lived with humans at different times in history.
D、To show that the mice 过大 exist in our evolutionary history for a long time×.

单选题 According to the author, advertisers who sell "carb-free" products ______.

A、offer healthy options
B、are responsible for obesity
C、are not telling the truth
D、value consumers' well-being