单项选择题 手机外壳分心线位置在（）。A.外壳边缘 B.外壳中间 C. 壳体内部 D.以上答案都不对 A、A.外壳边缘 B、B.外壳中间 C、C. 壳体内部 D、D.以上答案都不对

单项选择题 Match the term with the definition. _______: a method of helping a woman to have a baby in which an egg is removed from one of her ovaries, fertilized outside her body, and then replaced in her womb.  A、IVF B、fertile C、reproduction D、adoption

问答题 Tracy doesn’t have a boyfriend right now. She is _________.