[填空题]Birds, flowers, mammals.

[简答题]Flowers 　　Do you like flowers 　　Do flowers have special meaning in your culture 　　On what occasions do people in China give flowers to other people 　　When was the last time you gave flowers to someone 　　Do Chinese people ever grow flowers at home

[简答题]Part 1Birds Do you like birds What kinds of birds are there where you live Are there many birds around your neighborhood In your country, do birds have special meaning Do you think we should protect birds

[简答题]Some artificial flowers resemble real flowers so closely that it is__________________(很难区分) one from another.

[简答题]Part 1Flowers Do you like flowers Which kind of flowers do you like best Do people in your country like sending flowers Do you often send flowers Are they important to you Do you prefer plastic flowers or the real ones Would you like to keep flowers in your home or plant them in the open air

[简答题]part 1Flowers Do you like flowers What kind of flower do you like

[简答题]part 1Flowers Do you like flowers What kind of flower do you like

[简答题]part 1 Flowers Do you like flowers Why or why not What flowers do you like Why Are flowers important in your culture On what occasions do people give or receive flowers When was the last time you bought flowers for someone Where do people usually buy flowers

[填空题]The flowers need to be watered. The flowers need______ .

[简答题]Part 1Flowers Do you like flowers Why or why not What flowers do you like Why Are flowers important in your culture On what occasions do people give or receive flowers When was the last time you bought flowers for someone Where do people usually buy flowers Do flowers have special meaning in your country Do people grow flowers at home

[单项选择]A. Handbag and flowers. B. Flowers and a cake.
C. Shoes and a cake. D. A handbag and a pair of shoes.

[单项选择]
Mammals and birds generally maintain body temperature within a narrow range (36-38~C for most mammals and 39-42℃ for most birds) that is usually considerably warmer than the environment. Because heat always flows from a warm object to cooler surroundings, birds and mammals must counteract the constant heat loss. This maintenance of warm body temperature depends on several key adaptations. The most basic mechanism is the high metabolic rate of endothermy itself. Endotherms can produce large amounts of metabolic heat that replace the flow of heat to the environment, and they can vary heat production to match changing rates of heat loss. Heat production is increased by such muscle activity as moving or shivering. In some mammals, certain hormones can cause mitochondria to increase their metabolic activity and produce heat instead of ATP. This nonshivering thermogenes
A. Because marine animals have lost their hair during evolution.
B. Because heat is lost in water twice as fast as it is in air.
C. Because dry hair does not insulate marine animals.
D. Because they are so large that they require more insulation.