21. According to the reading, which is correct when we make the fruit tea?
(A) Boiling water with sugar in it.
(B) Making sure to take out the fruit.
(C) Putting in the fruit and the lemon juice at the same time.
(D) Leaving the teabags in the pot of hot water for 2 to 3 minutes.

考題觀念本題為閱讀理解題，測驗考生能否...