When things get wildly busy in the morning，some people don't have breakfast in order to save time.But that may be a big mistake for students.Whether at home，on the way to school or at school，eating something healthy for breakfast may help a student get better grades.
   Researchers looked at 5，000 9-to-11-year-olds from more than 100 primary schools in the UK.They looked at what the students ate for breakfast and then their grades.And 6 to 18 months later，they found that the students who ate a healthy breakfast were twice as likely to perform above average in educational activities.The researchers also found that unhealthy breakfasts—such as potato chips or a donut did not appear helpful to educational performance.In 2013，an organization in the United States，also looked at possible connections between breakfast and students' success in school.They found that on average students who ate breakfast provided by their school attended 1.5 more days of school per year.These students also scored 17.5 percent higher on standardized math tests.
   Health experts suggest that the best breakfast is a mix of complex carbohydrates （碳水化合物），protein and fat.This gives your body the energy it needs to think clearly and to remember what it learns.Wholegrain bread is an example.The report explains that the brain needs glucose （葡萄糖） to work well.Simply eating a breakfast rich in carbohydrates may make a student tired.So，adding protein helps to prevent fatigue （疲勞）.Having a protein such as milk，yogurt，eggs or meat can help students to feel full longer.Oatmeal （燕麥片），the researchers say，is an example of a breakfast that is rich in fiber and protein.It releases energy slowly because it is a wholegrain food.So，students will feel full longer.
   Health experts also suggest not eating too much for breakfast.This can also make a person feel tired and unable to think clearly.They say eating between 350 and 500 calories in the morning is a good amount of energy to start the day.

（1）What's the main purpose of Paragraph 1？

B

B

A．To analyze why breakfast is ignored （忽略）.
B．To lead in the main topic of the text.
C．To stress the effect of eating healthily.
D．To share a common mistake among students.
（2）How did the researchers carry out the researches？

D

D

A．By asking about students' living habits.
B．By providing students with free healthy breakfast.
C．By asking students to fill in varieties of forms.
D．By following and comparing students' breakfast and grades.
（3）Which is the best breakfast choice according to health experts？

D

D

A．Wholegrain bread and some juice.
B．A donut，an egg and a glass of milk.
C．An egg，a glass of milk and some potato chips.
D．Wholegrain bread with beef and a bowl of oatmeal.
（4）What is the text mainly about？

B

B

A．The way of cooking a large breakfast.
B．The importance of having a good breakfast.
C．How to stay energetic throughout the day.
D．How much breakfast we should eat each day.