单项选择题

According to the essay, it is now possible to ______.

A．transplant such organs as kidneys, hearts and lungs
B．transplant certain organs such as kidneys
C．transplant all organs between identical twins
D．transplant hearts between non-identical twins

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热门试题

单项选择题

According to the author, languages, whether civilized or not, have ______.

A．the potential for expanding vocabulary
B．their own sound patterns
C．an ability to transfer ideas
D．grammatical structures

单项选择题

The article states that grunt-and-groan forms of speech are found ______.

A．nowhere today
B．among the Australian aborigines
C．among Eastern cultures
D．among people speaking "backward" language