单项选择题

(Thirteen hundred) medical professionals, (all of which) have been trained to treat drug dependency, (attended) the annual convention (sponsored) by a society.

A. Thirteen hundred
B. all of which
C. attended
D. sponsored
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问答题
The theory of social Darwinism generally claims that individuals, groups and peoples or cultures are subject to the same Darwinian laws of natural selection as are plants and animals. The theory holds that superior individuals or groups survived and succeeded while the inferior disappeared, with a consequent benefit to society, and that the existing order must be the natural one. Any individual, group or institution that survives the struggle to exist over a long period of time is regarded as having displayed evidence for its own natural superiority and legitimacy, similar to the Darwinian concept of survival of the fittest . In history, this theory has been questioned because it could be easily used to justify political conservatism, imperialism, and racism.
单项选择题
The toy companies are rarely interested in making a toy bat probably because ______.
A．bats destroy crop-damaging insects
B．bats are the marvel of evolution adaptation
C．bats suck the blood of dying people
D．bats inspire disgust based on some traditional beliefs
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