How to practice reading treble clef?

I'm going to begin taking voice lessons in the fall. My voice teacher suggested I practice reading treble clef. I already know how to read treble clef but not as well as I used to when I took piano lessons. I'm looking for a way to practice treble clef independently without bass clef. Any tips or free iPhone apps I can use?

You can read flute music, its like piano music without the bass cleft, but as a higher octave.

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