Lots of people think Alaska is a_____ place but that’s not true（）
A. excited
B. exciting
C. bored
D. boring
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Our neighbors are warm and_____. They brought us a cake the day we moved in（）
A. friendship
B. friendly
C. friend
D. unfriendly
p®p*跃迁不能产生下列哪种吸收带（）
A. E1
B. E2
C. B
D. R
I found mountain climbing quite_when I first started but now I just love it（）
A. tough
B. perfect
C. terrible
D. wonderful
下列化合物中，同时有π→π， σ→σ跃迁的化合物是（）
A. 甲烷
B. 碘甲烷
C. 1,3-丁二烯
D. 甲醇
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