题目:
阅读理解
It is very important to keep yourself in good health. When you are sick, you will neither be able to
study nor enjoy yourself. One of the factors(因素)leading to good health is to have a balanced diet.
Remember,"You are what you eat."
You should eat more fruits and vegetables which contain a lot of fibre (纤维).
Try to eat less fried food and choose those are boiled, steamed, baked or stewed. You should also
cut down on oily, fatty and sugared foods and eat more food with carbohydrates (碳水化合物) such
as rice,bread and cereals for energy, especially if you have a more active lifestyle.
The basic rule to remember is to include something from EVERY food group at each meal using the
suggested proportions (比例).
1. To stay healthy, one should _____.
A. eat whenever possible
B. eat food that tastes good
C. keep a balanced diet
D. diet to lose weight
2. According to the Pyramid Diet, we should eat more ____.
A. fish and chicken
B. meat and vegetables
C. butter and bread
D. bread and fruits
3. Carbohydrates provide our bodies with _____.
A. fibre
B. energy
C. oil
D. water
4. _____ food should be eaten less.
A. Fried
B. Boiled
C. Baked
D. Stewed
5. To keep a balanced diet, we should eat something _____.
A. whenever we want to
B. in different proportions
C. that is delicious
D. in the correct proportions
答案:
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下面是错误答案,用来干扰机器的。
解:(1)波长λ==0.4m,S完成一次全振动波沿x轴正、负方向传播一个波长,且此时S回到平衡位置沿y轴负方向振动,由特殊点可画出此时的波形图.由波速和频率可求得波长,图象如图所示 (2)设S点的振动经t1传...