I . Phonetics(5 points)Directions:In each of the following groups of words, there are four underlined letters or lettercombinations marked A, B, C and D. Compare the underlined parts and identify theone that is different from the others in pronunciation. Mark your answer by blackeningthe corresponding letter on the Answer Sheet.1.
A、past
B、fast
C、grandson
D、reason
An estimated 50, 000 farmers ____the new method by the end of this year.