2023 Jilin Selected Students' Speech Comprehension: "Synonymic Exchange of Words"

Example

In the face of earthquakes, science still has great achievements. Through the study of seismic waves, people found that seismic waves include longitudinal waves and transverse waves. The former has faster propagation speed but less destructive power, while the latter has the opposite. Therefore, people can monitor the longitudinal wave of seismic wave with faster propagation speed through the seismic monitoring network and send a signal to the monitoring center. The monitoring center can send an alarm to the public and key facilities with radio waves through the client. In other words, earthquake warning is a "race" between radio waves and seismic shear waves, which gives people a warning before the seismic shear waves arrive.

This passage is intended to explain:

A. The monitoring difficulty of seismic shear wave is higher than that of longitudinal wave

B. The accuracy and speed of earthquake warning system need to be improved urgently

C. The development of radio wave technology is the prerequisite for realizing pre earthquake prediction

D. Scientific use of the time difference between two kinds of seismic waves can give effective earthquake warning

[Chinese public resolution] D. The passage first affirms that science has great potential in the face of earthquakes. Then, through the analysis of the propagation speed and destructive power of seismic shear and longitudinal waves, it points out that after the longitudinal waves are monitored, the earthquake warning can be issued in time before the arrival of shear waves. In the last sentence, "that is to say" is a synonym, which plays a role in further summarizing and explaining the passage, so the main idea of the passage is the last sentence, That is to say, the time difference between two seismic waves can be used by the D term to send out an effective earthquake alarm.

Item A, the article does not involve the comparison of the difficulty of seismic transverse and longitudinal wave detection, and it is excluded; Item B, whether the accuracy and speed of the seismic alarm system need to be improved is not involved in this paragraph, and it is excluded; Item C, which is the non key content of the paragraph, is excluded. The key point of the passage is that the earthquake warning can be issued in time after the longitudinal wave is monitored and before the arrival of the shear wave. The earthquake warning can be issued in time after the longitudinal wave is monitored and before the arrival of the shear wave, so the answer to this question is D.