"Whale" PPT courseware 8

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"Whale" PPT courseware 8

Study the first paragraph of the text (natural paragraphs 1 and 2)

After reading the first paragraph, do you understand what is the most obvious characteristic of a whale’s body shape?

(big, behemoth)

From what sources did you find out?

Much bigger than an elephant.

The largest whale weighs 160,000 kilograms, and the smallest weighs 2,000 kilograms.

Our country has captured a 40,000 kilogram whale, which is 17 meters long and has a tongue as heavy as a dozen big fat pigs.

Why did the author write this?

Use numbers, examples, and comparisons to tell us that whales are very, very big animals.

Study the first paragraph of the text (2 natural paragraphs)

How did whales evolve into fish?

Words such as "very distant ancient times", "a very long time" and "gradually" indicate that this evolutionary process is long.

The same is true for us humans evolving from apes. This process is also very long.

The living habits of whales (1)

Eating---Whales eat a lot of food

Baleen whales mainly eat shrimps and small fish, and can eat more than 2,000 kilograms in one meal.

Toothed whales mainly eat large fish and sea animals. There is a kind of killer whale known as the "Tiger of the Sea", which often forms a group of dozens, surrounds a fin whale weighing more than 30 tons, and eats it up in a few hours.

The living habits of whales (2)

Whales breathe with their lungs, which create a column of water when they exhale.

Baleen whale water column

Vertical, thin and tall

toothed whale water column

Sloping, thick and short

The living habits of whales (3)

Whales sleep every day. Ask the students to imagine and draw a whale sleeping according to the narrative in the text.

Why do whales sleep like this?

This is a kind of self-protection, and you can swim away if there is danger.

Explanation method: give numbers, give examples, compare

Introduce something by enumerating numbers.

Example 1: This corridor is more than 700 meters long and divided into 273 rooms.

Example 2: This is a double-arch bridge with a total length of about 265 meters and 241 pillars, each with a lion carved on it.

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Update Time: 2024-09-09

This template belongs to Chinese courseware S version fourth grade Chinese language volume 2 industry PPT template

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