C.It cures the disease.
D.It sprays over healthy plants.
解析:选A。推理判断题。根据倒数第二段中的“When the scientists
fed HexVic to cutworms, it knocked down their survival rate by 17%”和“Those plants were then able to start producing the cutwormkilling HexVic”可知,A项正确。
7.It can be inferred from the text that ________.
A.there are not chemical signals
B.the phenomenon may be happening in less plant species
than tomatoes
C.farmers may benefit from the further studies
D.plants are warned first by their neighbors
解析:选C。推理判断题。由文章的最后一句可推知,通过进一步的科学研究可以提高农业效率,农民会从中受益,即C项正确。
8.The passage is likely to appear in ________.
A.a newspaper advertisement
B.a physics textbook
C.a science magazine
D.a finance report
解析:选C。推理判断题。根据文章内容可推知,本文应该是一篇科研报告性质的文章,即C项正确。
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