Two: vertical: the second vertical line of the ground: the ground gets the ground.

Three: (1) Gaze, look down, look up (2) Look around, look around, jump up and down (2) Swim around, give and receive, benefit others and benefit themselves (3)

Four: 1. What special skills do bats have to fly freely in the night sky? 2. Why can bats without eyes distinguish the objects in front and catch flexible moths? 3. Can the bat's movie-like wings not only fly, but also gain insight into everything at night? Bats fly at night and catch food. It turns out that they rely on hearing to identify the direction and confirm the goal!

5. Uncover (reveal) the mark of quickness (quickness) and dexterity (agility): It turns out that bats test their throats and make ... fly deftly and freely to catch food.

Famous saying: Diligence is good at diligence, which is wasted on play, and action is destroyed by thinking-Han Yu

Expanding exercise: 1 The object of this article is bioelectricity. Around bioelectricity, it shows that our human body can discharge, so can fish in water, and bioelectricity plays a great role in medicine. Bioelectricity also plays a great role in electronic imitation. 2. The whole life movement is inseparable from electrical stimulation to transmit information.

3.( 1)

Hope to adopt, thank you!