2.What's the function of HexVic?
A.It damages the cutworm's body.
B.It shows up more.
C.It cures the disease.
D.It sprays over healthy plants.
答案:A 考查推理判断。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。
3.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
答案:C 考查推理判断。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。