About 5 million acres in the United States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering rangeland worthless.
(A) States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering
(B) States have been invaded by leafy spurge, a herbaceous plant from Eurasia, with milky sap, that gives mouth sores to cattle and displaces grasses and other cattle food, rendering
About 5 million acres in the United States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering rangeland worthless.
(A) States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering
(B) States have been invaded by leafy spurge, a herbaceous plant from Eurasia, with milky sap, that gives mouth sores to cattle and displaces grasses and other cattle food, rendering
About 5 million acres in the United States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering rangeland worthless.
(A) States have been invaded by leafy spurge, a herbaceous plant from Eurasia with milky sap that gives mouth sores to cattle, displacing grasses and other cattle food and rendering
(B) States have been invaded by leafy spurge, a herbaceous plant from Eurasia, with milky sap, that gives mouth sores to cattle and displaces grasses and other cattle food, rendering
第一組差異點是 with milky sap是修飾a herbaceous plant還是修飾leafy spurge。但這裡你或許不是很能確定。因為這一堆字你都不懂。沒關係，一個題目不會只有一個解題點，不熟的點請務必先跳過，不要一開始就賭身家。
後方第二組差異點就相對熟悉很多了，是在考三個動作在語意上的關係：
A選項的結構是gives... , displacing ... and rendering...
B選項則是gives ...and displaces..., rendering...
這時再來讀語意，你就知道重點了。give mouth sores to cattle儘管不懂意思，但至少知道是影響牲口。displaces grasses and other cattle food儘管不懂意思，但至少知道是影響植物。一個影響動物，一個影響植物，兩件事的關係應該是並列獨立的，而不是「影響動物所以連帶影響到動物吃的植物」（如果要合理應該是倒過來吧？應該是影響動物吃的飼料才會去影響動物）。因此答案選B，而不是選A。