逆向飞行,改变高度的航空器,在与被穿越的航空器预计相遇点前()分钟,上升或下降至被穿越航空器的上或下一个高度层。
A.5
B.10
C.15
D.20
参考答案:B
花斑癣在Woods下呈现()。
A.无色
B.亮绿色
C.暗绿色
D.棕色
E.黄白色
根据括号里所给的汉语写出英语单词。
1. I am in ________ (班) Six, Grade Seven.
2. Tom and I are ________ (同学). We are in the same class.
3. My mother _________ (工作) on a farm. She is a farmer.
4. We usually eat rice and vegetables for _________ (晚餐).
5. _________ (熊猫) are my favorite animals. They are cute.