列车车次的前面两位数表示（）。A.目的地码 B.服务号 C.上下行 D.无意义
题型：单项选择题
问题：
列车车次的前面两位数表示（）。
A.目的地码
B.服务号
C.上下行
D.无意义
题型：单项选择题
| 根据以下描述，判断是哪一个季节，写出来，并将图片序号填在题前括号里。 |
| ( ) 1. Trees are green now. It's very hot. You like to eat ice-cream. You can wear T-shirt. Which season is it? It's . | A. |
| ( ) 2. It's a wonderful season. It's windy and warm. You can wear shirt, jacket or sweater. It's . | B. |
| ( ) 3. It's windy and cold. It often snows. You can wear your heavy coats and shoes. It's . | C. |
| ( ) 4. It's windy and cool. Leaves begin to turn yellow. You can have a picnic. You can wear T-shirt or sweater. Farmers are very busy. It's . | D. |