红外线气体分析仪采用哪种波长检测七氟烷（七氟醚）浓度（）
A.3.3μm
B.4.3μm
C.2.3μm
D.5.3μm
E.1.3μm
参考答案：A
All that this young man dreams of is to make________and live________.[ ]
A. a big fortune; an easy life
B. a big money; an easy life
C. big fortune; easy life
D. big money; easy life
— Can you go by ship _____________ by train?
— I can go by train. [ ]
A. and
B. by
C. or
