阅读理解。
Which would you like a hot dog, a hamburger, or a piece of pizza? Young people of today select
pizza as their favorite food. Hot dogs were number one in the past, but now they are third in the list.
Hamburgers are second.
After World War II, pizza came to the United States from Italy. Since then it has become more and
more popular. Every American eats about thirty-one slices of pizza each year.
Pizza has more food value than hamburgers and hot dogs. That is, pizza is one kind of healthier food
for your body. There are many kinds of pizza, but a plain cheese pizza is still the most popular.
1. The second popular food among young people today is _____.
A. hot dogs
B. pizza
C. hamburgers
D. cheese
2. Today, hot dogs are the_____.
A. cheapest food
B. most popular food
C. most healthy food
D. third most popular food
3. The best title (标题) for the passage is
A. Pizza-The Favorite Food
B. Pizza and World War II
C. Pizza Keeps You Healthy
D. Hot dogs and Hamburgers
4. How much pizza does one American eat each year?
A. One piece of bread.
B. Two slices of pizza.
C. Thirty pieces of bread.
D. Thirty-one slices of pizza.
5. Is the pizza healthy for our body?
A. Yes, it is.
B. No, it isn't.
C. Sorry, I don't know.
D. Yes, they are.
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3
8SO2+2Fe2O3，该反应的氧化产物是 ，当生成8 mol SO2时转移电子的物质的量为 。
2SO3。某科技小组的同学在一个恒温恒容的容器中模拟该反应，他们分两次进行实验，第一次向容器中加入2 mol SO2、1 mol O2，反应达平衡后测得SO2的转化率为α1，第二次向容器中加入3 mol SO2、1.5 mol O2, 反应达平衡后测得SO2的转化率为α2，则α1 α2（填“大于”、“等于”或“小于”）。