答案：

　　46.根據原文“He liked dancing most”，故選擇 B。

　　47.根據原文“Bob‘s high school didn’t have a boy‘s dancing group but a girl’s group”故選擇 A。

　　48.根據原文“Other boys will want to join. Soon， there won‘t be any girls in the group.”故選擇 B。

　　49.根據原文“The judge said it was not a right decision”。故選擇 D。 50. We can infer(推斷)that Bob felt __ when he went back to the group.

　　50.根據原文推斷，Bob 心愿達成，所以會感到快樂的。故選擇 C。