问this和that的th发音一样吗

发音一样，都发/ð/音。

This is the one I want.这就是我要的那个。This suggestion dumbfounded Joe.这个建议使乔伊惊呆了。This knife needs sharpening.这把刀需要磨了。This suitcase doesn't lock.这手提箱锁不上。This drawer keeps sticking.这个抽屉老卡住。That book looks interesting.那本书好像很有趣。