1 . What will power your house in the future？Nuclear，wind，or solar power？According to scientists at the Massachusetts Institute of Technology (MIT) in the US，it might be leaves — but artificial (人造的) ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用)．Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂)．Similar to natural leaves，it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card，scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf，by contrast，is made of cheap materials，easy to use and highly stable. In laboratory studies，Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera's recent discovery of several powerful，new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now，the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides，the device can run in whatever water is available；that is，it doesn't need pure water. This is important for some countries that don't have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.
1. Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a．artificial leaves split water into hydrogen and oxygen
b．the hydrogen and oxygen gases are stored in a fuel cell
c．the artificial leaves are put in water
d．the fuel cell uses hydrogen and oxygen to produce electricity
2. The purpose of the scientists at MIT in developing the new artificial leaf is to________.
3. The main idea of this passage is ________.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用)．Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂)．Similar to natural leaves，it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell，which uses those two materials to produce electricity，located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card，scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf，by contrast，is made of cheap materials，easy to use and highly stable. In laboratory studies，Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera's recent discovery of several powerful，new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now，the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides，the device can run in whatever water is available；that is，it doesn't need pure water. This is important for some countries that don't have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”，scientists believe that the new technology could be widely used in developing countries，especially in India and rural China.
1. Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a．artificial leaves split water into hydrogen and oxygen
b．the hydrogen and oxygen gases are stored in a fuel cell
c．the artificial leaves are put in water
d．the fuel cell uses hydrogen and oxygen to produce electricity
| A．c，a，b，d | B．c，b，a，d |
| C．b，c，a，d | D．c，a，d，b |
| A．build up more power stations in the world |
| B．provide cheaper energy for developing countries |
| C．offer people in developing countries access to pure water |
| D．gain a deeper understanding of the photosynthesis process |
| A．an introduction to the history of artificial leaves |
| B．a mixture of water power and solar energy |
| C．giving energy to the poor |
| D．an invention copying photosynthesis |
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2014-03-28更新
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2 . School Groups:$10.00 per person
One free teacher admission per 10 students.
Group rates apply to groups 15 or more.
Click HERE to make a reservation online today!
The Miami Planetarium(天文馆) opened its doors to the public on November 4, 1966 and has entertained and educated children of all ages about astronomy and the wonders of the night sky ever since. The planetarium houses a 65-foot diameter doomed projection screen with 231 seats.
At the heart of the Planetarium is a SPITZ “Space Transit Planetarium” star projector(放映机), which is capable of accurately reproducing the stars and planets as seen from anywhere on Earth at any time during the year. Shows daily except Thanksgiving and Christmas Day. Unlike any other in South Florida, the Planetarium is a unique setting for bringing the stars and planets indoors in animated live star shows and music filled laser light shows.
The Weintraub Observatory（天文台） houses two powerful telescopes. Observatory hours are from 8:00p.m. to 10:00p.m. Look through the telescope to view the planets, the four moons of Jupiter, the rings of Saturn and deep sky objects such as galaxies, nebulas and double stars.
Deposit: A $ 75 deposit must be received 10 days ahead of the visit date to guarantee your visit.
Cancellation Policy：The museum requires 48 hours advance notice prior to any cancellation or other changes to a reservation. Without prior notification the original total will be expected upon arrival.
Payment Policy: The balance of the admission fee is due upon arrival at the museum on your visit day.
Upon arrival: The leading teacher should check in at the box office with payment for the correct head count of students and teachers. Visitors should remain on the bus until a museum interpreter show you around the museum.
Museum Etiquette: We ask that all groups remain together and orderly. Teachers are asked to help maintain order with their groups. We reserve the right to refuse service to any group or individual not obeying the museum policies.
Bus procedures: The museum will provide parking for buses in our parking lot. Upon arrival, bus drivers will be directed by the museum staff to the appropriate places to park. It is recommended that buses remain on the spots throughout the group’s entire museum visit.
For more information & reservations call: (305)646-4222.
1. In the Miami Planetarium, visitors can _________.
2. If twenty students are to visit the Miami Planetarium together with five teachers, how much will they have to pay for the admission fees in total?
3. To make sure that you can visit the Miami Planetarium on time, you must_____
4. We can infer from the passage that _________.
One free teacher admission per 10 students.
Group rates apply to groups 15 or more.
Click HERE to make a reservation online today!
The Miami Planetarium(天文馆) opened its doors to the public on November 4, 1966 and has entertained and educated children of all ages about astronomy and the wonders of the night sky ever since. The planetarium houses a 65-foot diameter doomed projection screen with 231 seats.
At the heart of the Planetarium is a SPITZ “Space Transit Planetarium” star projector(放映机), which is capable of accurately reproducing the stars and planets as seen from anywhere on Earth at any time during the year. Shows daily except Thanksgiving and Christmas Day. Unlike any other in South Florida, the Planetarium is a unique setting for bringing the stars and planets indoors in animated live star shows and music filled laser light shows.
The Weintraub Observatory（天文台） houses two powerful telescopes. Observatory hours are from 8:00p.m. to 10:00p.m. Look through the telescope to view the planets, the four moons of Jupiter, the rings of Saturn and deep sky objects such as galaxies, nebulas and double stars.
Deposit: A $ 75 deposit must be received 10 days ahead of the visit date to guarantee your visit.
Cancellation Policy：The museum requires 48 hours advance notice prior to any cancellation or other changes to a reservation. Without prior notification the original total will be expected upon arrival.
Payment Policy: The balance of the admission fee is due upon arrival at the museum on your visit day.
Upon arrival: The leading teacher should check in at the box office with payment for the correct head count of students and teachers. Visitors should remain on the bus until a museum interpreter show you around the museum.
Museum Etiquette: We ask that all groups remain together and orderly. Teachers are asked to help maintain order with their groups. We reserve the right to refuse service to any group or individual not obeying the museum policies.
Bus procedures: The museum will provide parking for buses in our parking lot. Upon arrival, bus drivers will be directed by the museum staff to the appropriate places to park. It is recommended that buses remain on the spots throughout the group’s entire museum visit.
For more information & reservations call: (305)646-4222.
1. In the Miami Planetarium, visitors can _________.
| A．look through the telescope to view the Mars at 11 p.m. |
| B．enjoy the roller coaster on the weekend. |
| C．watch animated live star shows on December 1 |
| D．watch animated live star shows on December 25 |
| A．$230 | B．$250 | C．$150 | D．$200 |
| A．pay the total admission fees in advance. |
| B．pay some of the admission fees in advance. |
| C．rent the bus owned by the planetarium |
| D．book the visit five days before the visit date |
| A．the Miami Planetarium has a history of over 60 years |
| B．the Miami Planetarium is very popular among moviegoers |
| C．the Miami planetarium is located in North Florida. |
| D．the Weintraub Observatory is not open to visitors during the day. |
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