题目内容

Please _____ the QR code on the desk.

A. break
B. tap
C. scan
D. fill

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Justamoment, please.I'llwrite _____ areceipt foryou.

A. to
B. in
C. about
D. out

We are looking forward to _____you again.

A. see
B. seeing
C. saw
D. seen

It is very important to ensure the _____ of mobile payment in case of hacker attacks.

A. security
B. quality
C. peace
D. success

计算机网络通信的常用介质有哪几种？请简述各自的特点。