动力车每个转向架设有（）台牵引风机对牵引电机进行冷却。
A.1
B.2
C.3
D.4
参考答案：A
阅读理解。
Do you eat good food every day? It’s important(重要)! You need oranges and bananas, but you don’t need ice cream. You need salad and broccoli, but you don’t need French fries. Write a list of the food you eat. Is it good food? Do you eat right? Every day?
1. Do you eat good food every day? (同义句)
Do you ________ _______ food every day?
2. What don’t you eat every day?
____________________________.
3. It’s important to _______ _______, _______ and salad every day.
4. What’s ice cream?
5. Do you need broccoli or ice cream?
真皮的主要成分是：
A．胶原纤维B．弹力纤维C．网状纤维D．基质E．成纤维细胞
