题目内容

15. I have a busy ______ this week.

A. day
B. message
C. reschedule
D. schedule

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Your achievement is the triumph of years of hard work, both of your own and of your parents and teachers.

You may have cried tears of joy to be finally finished with high school, and your parents may have cried tears of joy to be finally finished with doing your laundry!

So, with a glow in your eye and a song in your heart, step forward to meet these new experiences!

氧原子具有顺磁性可归因于（）。

A. 沸点极低；
B. 与铁易化合；
C. 有三电子π键；
D. 键级为2。