15.At such a time of crisis, we must try __ to all differences and stick together,
A、set aside
B、set back
C、set down
D、set forth
53.What can we learn about Mark Twain's autobiography from the passage?
A、It has been published against Twain's will.
B、It shows Twain's respect for politicians.
C、It will be published in full.
D、It has been recently finished.
Directions:In each of the following groups of words,there are four underlined letters or letter combinations marked A,B,C and D.Compare the underlined parts and iden-tdtify the one that is different from the others in pronunciation.Mark your answer by blackening the corresponding letter on the Answer Sheet。