5. We have been told that the contract is for one year starting from the fifteenth of June of this year.
A
effective
B
complicated
C
practical
D
significant
句意为：我们已经被告知协议从今年7月15日生效，有效期一年。A有效B复杂C实际D有意义。所以选择A。
此题是形容词辨析，首先要明确句意，其次判断缺位单词。
单词意思。