Why does social media get risky according to the author?
A、The users’ social connection is lost.
B、The users’ messages may be ignored.
C、The users ' real emotion may be hidden.
D、The users' voices can hardy be heard.
Directions:In each of the following groups of words, there are four underlined letters or ltter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet。