The air beacon is the only way for flying navigation in Montana, kind of lighthouses in the sky.
举一反三
- Which is the only way for flying navigation in the area off the grid?
- The should not be used when flying through clouds or overcast. A: navigation lights and flashing beacon B: strobe lights and flashing beacon C: strobe lights and courtesy lights
- Look! The bird _____ in the sky. A: flies B: is flying C: fly D: was flying
- Look! The plane has taken ________ and is flying ________ the sky.
- A few birds are<br/>flying ___ the sky. () A: in B: on