The first one you're using a "ch" (as in chair) sound, while the second one you're using a "j" sound (as in "judge"), correct? If so, the correct pronunciation is the first one. If you want to work on your pronunciation, I recommend using the following resources: --learn the International Phonetic Alphabet (IPA) through wikipedia or wiktionary in order to read the pronunciations listed for the wiktionary page entries. For example, the page for "question" has the pronunciation written in IPA: "/ˈkwɛstʃən/" --take advantage of the pronunciation recordings on the wiktionary pages, in this case http://en.wiktionary.org/wiki/question --use the text-to-speech feature of Google Translate. If you enter your text in the box on the left-hand side and click the "listen"/audio icon, it will pronounce the words for you. It can also pronounce the translations that appear on the right as well. E.g. enter the word in Chinese on the left, listen to the pronunciation of the translation on the right. I hope this helps. Good luck!

If you can't open that url, you can go with this one: https://soundcloud.com/freewind-2/which-is-the-correct