A-A+
Why does the author mention the discovery of A
问题详情
Why does the author mention the discovery of AIDS in the last paragraph？
A．To give an example of an incurable disease.
B．To illustrate the importance of preventative methods.
C．To exemplify a disease prevalent in the wealthy nations.
D．To use it s comparison to quickly spotted diseases.
参考答案
正确答案：D
解析：通过最后一段第一句话可知：因为微生物学和传染病的发展，科学家们可以很快地发现某种疾病。作者在括号中举例是为了提示读者，在医学尚不发达的当年．要花几年的时间才能发现某种疾病，以此与现在的情况形成对比。
