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【答案】1.C 2.C 3.C 4.A 5.C 6.A 7.C 8.B 9.C 10.C
【解析】
1. fifth和thin的th都发/θ/,father的th发/ð/.
2.that和there的th都发/ð/,maths的th发/θ/.
3.three和maths的th发/θ/,mother的th都发/ð/.
4.this和brother的th都发/ð/,birthday的th发/θ/.
5.fifth和thirteen的th发/θ/,there的th都发/ð/.
6.fifth和third的th发/θ/,there的th都发/ð/.
7.though和there的th发/ð/,three的th都发/θ/.
8.think和through的th发/θ/,that的th都发/ð/.
9.this和that的th发/ð/,the的the发/ðƏ/.
10.think和thin的th发/θ/,there的th都发/ð/.