锅炉在正常运行时，应使（）灵敏可靠。
A、安全附件
B、自动控制装置
C、燃烧装置
参考答案：A
Ben usually goes to Greece for vacation, but this time he wants to do _________.[ ]
A. different something
B. anything different
C. something different
D. different anything
Most species of this plant thrive in ordinary well-drained garden soil and they are best planted 8 cm deep and 5 cm apart.
A．develop well
B．grow taller
C．mature
D．bear fruit
