题目内容
The book Silent Spring, to a certain extent, marks the beginning of our understanding of modern ecology.
查看答案
搜索结果不匹配？点我反馈
更多问题
听力原文： Animals do many different, amazing things to get through the winter. Some of them travel to other places where the weather is warmer or they can find food. Many birds travel in the fall. (32) Because the trip can be dangerous, some travel in large flocks. For example, geese fly in noisy, "V"-shaped groups. Other kinds of birds fly alone. (33) How do they know when it is time to leave for the winter？ Scientists are still studying this. Many see transference as part of a yearly cycle of changes that a bird goes through. The cycle is controlled by changes in the amount of daylight and the weather. Most birds transfer shorter distances. But how do they find their way to the same place each year？ (34) Birds seem to navigate like sailors once did, using the sun, moon and stars for direction. They also seem to have a compass in their brain for using the Earth's magnetic field. Other animals transfer, too. (35) There are a few mammals, like some bats, and whales that travel in search of food each winter. Many fish transfer. They may swim south, or move into deeper, warmer water. Insects also transfer. Some butterflies and moths fly very long distances. For example, Monarch butterflies spend the summer in Canada and the Northern U. S. They transfer as far south as Merico for the winter. Most insects go much shorter distances. Many, like white ants and Japanese beetles, move downward into the soil. Earthworms also move down, some as far as six feet below the surface.
(33)
W: (19)However, you see, we do need exercises because we are getting lazy for keeping fit, and the health strength exercises And all of them can give the full reasons for their support. Now some doctors are strongly encouraging me to do arm exercises.
W: Arm exercises？ Is that because your arms are too fat or flabby？
M: Actually, that's not the main reason. (20) They say that arm exercises are an ideal way to become physically fit.
W: But don't arm exercises raise your blood pressure？
M: They do, But the article I read mentions ways to make up for that.
M: (21)By adding leg exercises, so the arms don't do all the work. Arm exercises aren't enough. It is said that the more of the body that involves in the exercise, the better.
W: And in turn, I'm sure that there is a greater chance of losing weight.
M: Sounds right to me.
W: So. what exercises do the experts recommend？
M: They mentioned quite a few. (22)But some of the more popular ones are cycling with special bicycles that make you use both your arms and legs, and walking vigorously while you wear arm weights.
W: I must try that. I like walking.
(23)
Why did the man want to see Ms. Owens？
The sentence "there is more approval for Russia's crackers throughout Russian than there is elsewhere" (Para. 4) means that ______.
微信支付 
支付宝支付