--- How much the pair of shoes?
--- Twenty dollars is enough.
A:is
B:are
C:was
D:were
小明将一根新鲜的黄瓜切成若干薄片后,分别浸泡在清水和浓盐水中,请问,哪种液体中的黄瓜薄片会失水变软?
长方体ABCD﹣A1B1C1D1中,AB=5,BC=3,AA1=2,则一只小虫从A点沿长方体的表面爬到C1点的最短距离是____