喜马拉雅山是一座年轻的山脉，其形成的原因是（ ）
健康成年人，一次失血超过（ ）就会危及生命．
Bill has a farm. There is a dog on his farm. It is brown and black and old. It can't run fast and it always like sleeping.
There are many other animals on the farm. There are ten hens, fifteen sheep, twelve ducks, eight cows and fourteen horses. The ducks like swimming. The sheep like eating grass.
根据短文内容，判断正误。
当你第一次自己上学，第一次考试得了100分，第一次帮助妈妈做饭，得到父母的夸奖时，你从中感受到（ ）
