语音辨析，选出一个与其他三个不同的单词
（1）A. ship      B. traffic         C. right      D. big
（2）A. train      B. wait           C. straight   D. this
（3）A. library    B. post office     C. hospital   D. pig
（4）A. get       B. cinema         C. tell      D. seven 
（5）A. north     B. south          C. thumb     D. them
（6）A. look      B. foot           C. cook      D. school
（7）A. staight   B. please          C. west       D. east
（8）A. week      B. evening        C. bike      D. meet