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问题 选择题

如图为光线在界面AE上发生的反射和折射现象，CG为法线，则折射角是

 [     ]

A、60°

B、50°

C、40°

D、30°

答案

答案：C

阅读理解
阅读理解。
    Charlottesville is a good place to have fun. If you go, here are some tips.
Where to stay
     The Foxfield Hotel is great. It's relaxing and quiet. You can have breakfast
there.
     Sugar Hotel is also a good place. Waiters working in it are very kind and
warm.                                                                                           --Julie
Where to eat
1. Bodo's Bagels. You can't go to Charlottesville without (没有) a trip to Bodo's.   It's across from the City Hall. Charlottesville is one of my favorite places in the
world!                                                                                       --Mark
2. Bizou Restaurant is always busy for lunch. So get there early. --Jim
3. Duner is a very great place to eat in Charlottesville. C&O Restaurant, 
second. Gearhardt's Chocolate on Bridge Street is also great for a quick  
(快的) meal.                                                                              --Kate

What to do
     During my second visit to Charlottesville, the weather is nice. We take a
taxi to the mountains (山) and take lots of photos.                       --Johnny

1. Waiters in Sugar Hotel are very _______.
A. friendly
B. shy
C. clever
2. You need to get to _______ early to have lunch.
A. Duner          
B. Bizou Restaurant
C. Bodo's Bagels
3. _______ takes a taxi to the mountains.
A. Mark  
B. Julie   
C. Johnny
4. The writer (作者) hopes more people will _______ in Charlottesville.
A. eat dinner        
B. have fun
C. take photos
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填空题

一种经济活动带来的外部不经济性就是（）。通过市场表现反映在产品或服务价格中真正发生或支付的费用即（）。（）是一种经济活动带来的社会真正承担的全部费用。
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