下列关于人在吸气时膈肌变化的叙述,正确的是( )
A:膈肌舒张,膈顶下降
B:膈肌舒张,膈顶上升
C:膈肌收缩,膈顶下降
D:膈肌收缩,膈顶上升
有一段演绎推理是这样的:“直线平行于平面,则平行于平面内所有直线;已知直线b⊈平面α,直线a⊆平面α,直线b∥平面α,则直线b∥直线a”的结论显然是错误的,这是因为____
一 A new 3D movie is on. Shall we go and see it this weekend?
一 ! What's it?
宽阔—____ 炎热—____ 顽劣—____
—What were your parents doing when you phoned me last night?—They ________with my grandparents.