Which of the following doesn't have a linking sound (连读)?
A:get out
B:an orange
C:sit down
D:a tree
Lucy was born ______ January 30th, 1998, when her sister got married ______ a fashion designer.
汉字中有近似轴对称图形,请写出3个:____,____,____。
蒲公英的种子像“小伞”;窃衣的种子、果实上有刺;飞猴有“翅膀”,这些说明了( )