4a U9(备课） 万思乐学V-learn小西妈双语工程1907期79号emily

汪梦千

一、Listening
1、儿歌：清华英语4a（1-12） 、凯叔讲历史
2、magic tree house 第二部 18
二、Reading
阅读：magic tree house第二部 18
三、Viedo
1、4a-9儿歌视频 Five Classes of Vertebrates

1、Mammals- A warm-blooded vertebrate with insulting hair and mammary glands. They do not lay eggs and they give birth to their young. They feed their young with milk. Examples are dogs, cat’s carabao cows, goats and pigs.
2、Birds- they are covered with feathers. Unlike mammals, they lay eggs with hard shells. Birds have one pair of legs and wings.

3、reptiles Examples are snakes, turtle’s lizards and crocodiles.
4、Amphibians- Ectothermic(变温） vertebrates intermediate without fish and reptiles that spend part of their life on land and part of the water. When they are young they live in water and when they already mature they live inland. Examples are frogs and salamander.
5、Fishes- A cold-blooded vertebrate whose gills fins and scales adapt it to living in the water. They lay eggs and their gills used for breathing.

Invertebrates

They are animals without backbones.

Groups of Invertebrates

1、Porifera海绵动物(sponges) - Pore-bearing animals
2、Coelenterates腔肠动物(hydras水螅属动物) - Hallow-intestine （尤指无脊椎动物的）肠管animals
3、Platyminthes扁形动物门(flatworms, tapeworms扁虫、绦虫) - Flattened elongated细长的 warm-like animals
4、Nematodes（无脊椎）线虫，线虫类(roundworms蛔虫) - Elongated unsegmented 非分段的warm-like animals
5、Mollusks[无脊椎]软体动物(snails, clams, squids) - Soft-bodied animals usually living in a shell or exoskeleton外骨骼
6、Anthropods[无脊椎]节肢动物(insects, crabs, spider, centipedes蜈蚣) - They are segmented分段的 animals with hardened outer skeleton and jointed appendages分节的附肢.
7、Echinoderms[无脊椎] 棘皮动物( starfish, sea urchin) - They are spiny-skinned animals

Examples of viviparous animals
Rabbit : your pregnancy time is, in general, less than 30 days.
Giraffe : it’s gestation period lasts about 15 months.
Elephant : these mammals have pregnancies that last between 21 and 22 months.
Cat : the gestation time of these animals is between 60 and 70 days, approximately.
Mouse : an animal like this does not spend more than 20 days in the womb.
Bat: the pregnancy period of this animal is between 3 and 6 months, depending on the cases.
Dog: 9 weeks is what lasts, approximately, the pregnancy of these animals.


Whale: the pregnancy of an animal like this can last up to a year.
Bear : the pregnancy of this wild animal can last up to 8 months.
Pig : the gestation period of this farm animal is around 110 days.
Horse: these animals have a pregnancy that lasts about 11 or 12 months.
Cow : before giving birth, this ruminant is about 280 days pregnant.
Sheep : a sheep must be about five months pregnant before giving birth to its young.
Koala : the pregnancy itself of these marsupials lasts about a month. Although it must be taken into account that the breeding is not fully developed, but continues to form in the marsupial bag.
Chimpanzee : these animals have a gestation period that lasts a little less than 9 months.
Dolphin : these mammals have a gestation period that is around 11 months.


Kangaroo : in this type of marsupials, pregnancy lasts about 40 days. As in the case of the koala, the development of the offspring is prolonged outside the maternal womb, in the marsupial pouch.
Chinchilla: the gestation period of these rodents is approximately 110 days.
Donkey : the pregnancy of these animals lasts approximately 12 months.
Rhinoceros: the pregnancy of these animals is one of the longest, since it can last up to a year and a half. 卵生动物，胎生动物再次复习，还有动物分类哺乳类，爬行动物，鸟，两栖动物、鱼。
羽毛、鳞片、beak、bill 、体温，冷血动物还是常温动物，不光是蛋，有硬壳的，还有鱼、青蛙的卵，卵生动物分海陆空，鱼类，禽类，爬行类，研究动物的年代，天上飞，海里游的留下来，

复习显生宙、就是看得见生物的年代，较高等动物，古生代，中生代、新生代、5.7亿年前，从寒武纪开始，有外壳清晰的骨骼结构的动物开始叫显生宙，恐龙地质时期，古生代包括寒武纪，奥陶纪、至六级，泥盆纪、石炭纪、二叠纪、中生代，三叠纪，侏罗纪、白垩纪、侏罗纪的恐龙和白垩纪的恐龙有什么区别，恐龙是从什么年代有的，学语文要学历史，复习时间轴，每个地质年代的代表性动物，有哪些特征。背记下来了
对自然界和生命的探索，

卵生动物分类、带鳍的和带羽毛的，带脚的，可以飞的，滑行的，蚯蚓是卵生动物，雌雄同体，断体重生，科二里面有一本书，性成熟期，身上有环带，交配生宝宝。有鳞片的，观察青蛙的卵，观察小蝌蚪怎么变青蛙。复习动物大百科、恐龙的探索，哺乳动物和卵生动物的区别，观察真的恐龙单，乌龟蛋，孔雀、鸵鸟蛋。淘宝上购买各种蛋，看是否能孵化。做好计划，孵蛋鸽子蛋，逗妈，蝴蝶爸爸，蚕宝宝，养少一点。83：40