Questão #10963552016

Inglês

Imagem da questão

The pronoun this (in bold type in the 2nd paragraph) refers to

A the fact that drugs that seem promising in lab and animal studies have a notoriously high failure rate in human trials. B phosphoethanolamine has been shown to kill tumor cells only in lab dishes and in mice, not humans. C some chemists at the University of São Paulo’s campus in São Carlos have manufactured the compound for years. D those patients who have claimed remarkable recoveries, perpetuating the compound’s reputation. E administrators at the university estimate that it covers about 80% of the orders they have received for the compound.

Inglês

Uma questão respondida. E as próximas?