Questions 44-46 Listen to part of a

Questions 44-46 Listen to part of a radio program about environmental issues.
Are electric cars the way of the future? Automobile manufactures are under pressure
to develop cars that do not pollute. One powerful motive is a California law requiring that
by the year 2000 ten percent of new car sells in the state be so called zero-emission
vehicles. These cars must put no pollutants whatsoever into the atmosphere.
California is a huge market for the automobile companies, so they are working hard to
meet these standards. So far the electric car seems to be the best alternative. So the
big advantage of electric cars is that they don’t pollute. However they will be in
competition with gas-powered cars and that’s where the weaknesses come out.
The big problem is that the batteries that power electric cars weigh a lot relative to the
amount of power they deliver. For instance, in one prototype electric car, the batteries
weighed 400 kilograms. And they provide enough energy to go 250 kilometers before
recharging, which takes eight hours. Compare that to a moderately fuel-efficient
conventional car, it can go 600 to 700 kilometers on a tank of gas and refilling takes just
minutes. If there are other drains on an electric car’s batteries besides the motor,
headlights, air-conditioning or a heater, its already limited range will be significantly
reduced. So automobile engineers are trying to make more powerful batteries that would
increase the cars’ range and make them more attractive to buyers.
44. What is the talk mainly about?
45. What is the main advantage of electric cars over gas-powered cars?
46. What is the main drawback of the electric car?
Questions 47-50 Listen to a talk given at a museum of natural history.
I’d like to welcome you all to the Museum of Natural History. Today’s tour will take us
through our newly renovated dinosaur exhibit where we have the largest collection of
dinosaur fossils anywhere in the world.
Before we begin the tour, let me mention that there have been some major
modifications to some of the exhibits over the past three years. Basically these changes
were made because of recent changes in the way scientists interpret dinosaur behavior.
For example, when we get to the first room, you’ll be able to see that the tyrannosaur’s
rex skeleton is no longer standing upright with its tail dragging on the floor. That’s
because paleontologists as they examined the area around its footprints more closely,
realized they could find no evidence of a heavy dragging tail which would have left behind
marks in the earth. In its new position, the backbone is parallel to the floor, its head is
pushed forward and its tail is stretched out acting as a counterweight. This new pose
stresses the relationship between dinosaurs and modern birds and supports the theory
that dinosaurs are actually more closely related to birds than to any other existing
creature.
Let me also point out that we have changed the way we grouped dinosaurs in our
displays. There’s a new school of thought called kledistics where scientists determine
relationships among the animals according to common physical characteristics. The
plesiosaurs and the oviraptour for instance, are separated by 148 million years. But
they are grouped together here, because they both have a grass bean forefoot and an
s-shape neck, physical evidence that they are indeed related. So now the exhibition
halls are arranged more like a family tree rather than the work-through tine that they used
to be.
47. Why has the museum modified its dinosaur exhibit?
48. According to the speaker what is the tyrannosaur’s rex new position evidence of?
49. Why are the plesiosaurs and the oviraptour displayed together?
50. How were the dinosaurs originally grouped in the exhibit?

Kết quả (Việt) 1:

Câu hỏi 44-46 nghe một phần của một chương trình phát thanh về vấn đề môi trường.Những chiếc xe điện đường của tương lai? Nhà sản xuất ô tô đang chịu áp lựcđể phát triển chiếc xe mà không gây ô nhiễm. Một động cơ mạnh mẽ là một luật pháp California đòi hỏi màvào năm 2000 mười phần trăm của mới xe bán trong bang như vậy được gọi là zero-emissionxe. Những chiếc xe phải đặt không có chất gây ô nhiễm nào vào khí quyển.California là một thị trường rộng lớn cho các công ty ô tô, do đó, họ đang nỗ lực đểđáp ứng các tiêu chuẩn này. Cho đến nay chiếc xe điện dường như là lựa chọn tốt nhất. Do đóCác lợi thế lớn của ô tô chạy điện là rằng họ không gây ô nhiễm. Tuy nhiên họ sẽ trongcạnh tranh với xe ô tô chạy bằng khí và đó là nơi mà các điểm yếu đi ra.Các vấn đề lớn là pin năng lượng và xe điện cân nhắc rất nhiều tương đối để cáclượng điện họ cung cấp. Ví dụ, trong một chiếc nguyên mẫu xe điện, pincân nặng 400 kg. Và họ cung cấp đủ năng lượng để đi 250 cây số trước khinạp thêm tiền, mà mất tám giờ. So sánh đó để một vừa phải tiết kiệm nhiên liệuchiếc xe thông thường, nó có thể đi 600 đến 700 km trên một chiếc xe tăng của khí và bơm mất chỉphút. Nếu có các cống trên một chiếc xe điện pin ngoài động cơ,đèn pha, điều hòa nhiệt độ hoặc một nóng, phạm vi đã giới hạn sẽ đáng kểgiảm. Do đó, xe ô tô kỹ sư đang cố gắng để làm cho mạnh mẽ hơn pin nàoincrease the cars’ range and make them more attractive to buyers.44. What is the talk mainly about?45. What is the main advantage of electric cars over gas-powered cars?46. What is the main drawback of the electric car?Questions 47-50 Listen to a talk given at a museum of natural history.I’d like to welcome you all to the Museum of Natural History. Today’s tour will take usthrough our newly renovated dinosaur exhibit where we have the largest collection ofdinosaur fossils anywhere in the world.Before we begin the tour, let me mention that there have been some majormodifications to some of the exhibits over the past three years. Basically these changeswere made because of recent changes in the way scientists interpret dinosaur behavior.For example, when we get to the first room, you’ll be able to see that the tyrannosaur’srex skeleton is no longer standing upright with its tail dragging on the floor. That’sbecause paleontologists as they examined the area around its footprints more closely,realized they could find no evidence of a heavy dragging tail which would have left behindmarks in the earth. In its new position, the backbone is parallel to the floor, its head ispushed forward and its tail is stretched out acting as a counterweight. This new posestresses the relationship between dinosaurs and modern birds and supports the theorythat dinosaurs are actually more closely related to birds than to any other existingcreature.Let me also point out that we have changed the way we grouped dinosaurs in ourdisplays. There’s a new school of thought called kledistics where scientists determinerelationships among the animals according to common physical characteristics. Theplesiosaurs and the oviraptour for instance, are separated by 148 million years. Butthey are grouped together here, because they both have a grass bean forefoot and ans-shape neck, physical evidence that they are indeed related. So now the exhibitionhalls are arranged more like a family tree rather than the work-through tine that they usedto be.47. Why has the museum modified its dinosaur exhibit?48. According to the speaker what is the tyrannosaur’s rex new position evidence of?49. Why are the plesiosaurs and the oviraptour displayed together?50. How were the dinosaurs originally grouped in the exhibit?