单项选择题

When the author says that "the results of the protests and other tactics have been mixed" (in Para. 3), he means the protest and other tactics ______.

A．have produced desired effects
B．almost amounted to nothing
C．have some influence on the public
D．have proved to be too radical

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单项选择题

1975 was an important year in the history of animal treatment because ______.

A．many people began to call for humane treatment of animals that year
B．a new book was published that broadened the animal rights movement
C．the environmentalists began to show interest in animal protection
D．the trapping of animals began to go wild all through the world

单项选择题

Economists think of the missing 10% of holiday spending a deadweight loss because ______.

A．the cash value of the purchase is lower than the buying price
B．it makes many people even worse off for spending more on unwanted gifts
C．with the money the recipients can be better off for no extra cost
D．it is actually a waste of resources in economic terms

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