Optical frequency comb provides an ideal light source for high-resolution molecular spectroscopy. Dual-comb spectroscopy relying on two asynchronous optical combs can analyze the optical comb teeth in the radio frequency domain. It has the advantages of wide spectral range, high resolution, high precision, and short measurement times. However, its application in industrial fields is limited due to its high system complexity and susceptibility to environmental noise. This paper explores and enhances frequency comb interference spectroscopy (FCIS) technology based on optical heterodyne detection between a single optical comb and a continuous-wave laser. Through high-frequency electronic devices and high-speed data acquisition system, the single-shot spectral range is expanded to 66GHz (or 0.5 nm), so that it can realize the simultaneous measurement of 660 longitudinal modes within 10 μs. The near-infrared molecular spectra of acetylene and hydrogen cyanide were measured with high resolution. The spectral resolution reaches 50 MHz (0.4 pm) and the spectral precision is 0.3 pm. The experimental results are consistent with the HITRAN database, showing that the system can be used for rapid and high-precision gas spectral measurement and quantitative analysis. This study thus offers valuable insight into advancing high-resolution optical comb spectroscopy technology suitable for industrial gas monitoring.