从fastq文件中的读取对中选择随机读取

I have a question about random selection of a read from a sampled pair-end fastq files. I read some topics regarding this manner but none could solve my problem, which is: I got two fastq files R1.fastq and R2.fastq. What I want to achieve is to randomly sample those files and from each sampled pair of reads I want to randomly select only one read.I have a question about random selection of a r