题目内容

I'm ____(delight) I was able to help.

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Thanks for ____(help) me with my housework yesterday.

It was very thoughtful of you to ____(send) me the get-well card yesterday.

We would welcome the opportunity of ____(reciprocate) your kind hospitality.

当氧气吸附到SnO2上时，下列说法正确的是（）

A. 载流子数下降，电阻增加
B. 载流子数增加，电阻增加
C. 载流子数增加，电阻减小
D. 载流子数下降，电阻减小