Which of the following can best explain the underlined word "elusive" in Paragraph 1?（ ）
A.正确答案BEffective
B.Difficult to find
C.Impractical
D.Hard to understand
Which of the following can best explain the underlined word "elusive" in Paragraph 1?（ ）
Which of the following can best explain the underlined word "elusive" in Paragraph 1?（ ）
A.正确答案BEffective
B.Difficult to find
C.Impractical
D.Hard to understand
