The pasture is the setting for the work of Dr、 Faustus.()
The pasture is the setting for the work of Dr、 Faustus.()
The pasture is the setting for the work of Dr、 Faustus.()
In the years after World War I a food revolution【C20】______ that was reminiscent of the one that occurred after the Civil War. The output of the food; manufacturing industry quadrupled from 1900 to 1940. In that interval, as we have mentioned earlier, home canning gave way to commercial canning, and the labor of housekeeping was lightened.
【C1】
A.to change
B.changing
C.change
D.changed
A.erosion
B.depletion
C.violation
D.delusion
A.pasture
B.passage
C.patience
D.passion
They divided the work. Hazen methodically screened and cultured scores of soil samples, which she then sent to her partner, who prepared extracts, isolated and purified active agents, and shipped them back to New York, where Hazen could study their biological properties. On a 1948 vacation, Hazen accidentally collected a clump of soil from the edge of W.B. Nourse's cow pasture in Fauquier County, Virginia, that, when tested, revealed the presence of the microorganisms. In farm owner Nourse's honor, Hazen named it Streptomyces noursci , and within a year the two scientists knew that the properties of their substance distinguished it from previously described antibiotics. After further research they eventually reduced their substance to a fine, yellow powder, which they first named "fungiciden", then renamed "nystatin"(to honor the New York State laboratory) when they learned the previous name was already in use. Of their major discovery, Brown said lightly that it simply illustrated "how unpredictable consequences can come from rather modest beginnings."
What is the main topic of the passage?
A.The lives of Hazen and Brown.
B.The development of a safe fungicide.
C.The New York State Department of Health.
D.The development of penicillin.
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