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Module 2 DNA—the Secret of Life单元检测题
★第一节 单项填空(共15小题；每小题1分，满分15分)
21. - Do you know why Johnson didn’t come to the meeting?
- No. I’m curious. It’s very ______ for him to miss a meeting.
A. common B. seldom
C. rare D. normal
★第一节 单项填空(共15小题；每小题1分，满分15分)
21. - Do you know why Johnson didn’t come to the meeting?
- No. I’m curious. It’s very ______ for him to miss a meeting.
A. common B. seldom
C. rare D. normal
