A：in, at
B：at, in
C：at, with
D：with, with
长株潭三城市位于湖南省的（ ）
She pretended _______ me when I passed by.
When he was running after his brother, the boy lost his ___ and had a bad fall.
将小球竖直向上抛出，一段时问后小球落回抛出点．若小球在运动过程中所受空气阻力的大小保持不变．在小球上升、下降过程中，运动时间分别用t1、t2表示，损失的机械能分别用△E1、△E2表示．则（ ）
