The chief engineer of the high-speed railway ________ Shanghai to Beijing always devotes most of his time ________ his work.
A：connecting; to
B：connects; to
C：connected; on
D：connect; on
废旧电池应该回收，只是因为废旧电池还可以重新利用。（ ）
下列地理位置写法正确的是（ ）
比一比，在组词
园____ 证____ 做____
圆____ 正____ 作____
