SummarizationRead each of the following short paragraphs and complete the phrase or sentence that expresses the main idea of the paragraph. The first letter of the missing word is given before the blank.Paragraph 5.Traditionally, large numbers of existing substances get tested until one is found that will produce a desired effect. Since disease involves the action of proteins, scientists are hoping to bioengineer drugs with specific molecular structures, tailoring them either to Promote or inhibit the effect of proteins in the body.5. An e_______for new drugs against diseases.
【正确答案】：experiment
【题目解析】：P147
