______ scientists know where a storm will hap...

______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.

A．Even if            B．Since             C．Despite           D．Unless

高二英语单项填空中等难度题查看答案及解析

______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.

高二英语单项填空简单题查看答案及解析

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

A．c，a，b，d　　　　　　　 B．c，b，a，d

C．b，c，a，d　　　　　　 D．c，a，d，b

2.The purpose of the scientists at MIT in developing the new artificial leaf is to________.

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

3.The main idea of this passage is ________.

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

高二英语阅读理解中等难度题查看答案及解析

Scientists still wonder whether cloning will help or harm us and where it ____ us.

高二英语单项填空简单题查看答案及解析

Whenever we see a button, we are eager to press it because we know something will happen. This is true in most cases, for example on a doorbell and on the “on/off” button on the TV. But some buttons are actually fake, like the “close” button on a lift.

Many people are in the habit of pressing the “close” button because they don’t have the patience to wait for the lift doors to shut. But lifts’ “close” buttons are a complete scam(骗局), at least in the US-the doors will not close any faster no matter how hard you press.

It started in the 1990s when the Americans with Disabilities Act was passed in the US, making sure that all lifts stayed open long enough so that people with disabilities could enter. Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.

But to normal lift riders, the buttons aren’t completely useless. According to psychologists, fake buttons can actually make you feel better by offering you a sense of control.

“Perceived (能够感知的)control is very important. It reduces stress and increases well-being,” Ellen J. Langer, a psychology professor, said, “having a lack of control is associated with depression.”

Experts have revealed that a lot of buttons that don’t do anything exist in our lives for this same purpose. For example, many offices in the US have fake thermostats(温度调节器) because people tend to feel better when they think they can control the temperature in their workspace.

But psychologists found it interesting that even when people are aware of these little “white lies”, they still continue to push fake buttons because as long as the doors eventually close, it is considered to be worth the effort.

“That habit is here to stay,” John Kounios, a psychology professor, said. “Even though I have real doubts about the traffic light buttons, I always press them. After all, I’ve got nothing else to do while waiting. So why not press the button in the hope that this one will work?”

1.What was the author’s main purpose in writing the article?

A. To analyze the functions of fake buttons

B. To describe some different kinds of fake buttons

C. To explain the advantages and disadvantages of fake buttons

D. To explore people’s different habits when it comes to pushing buttons

2.In America, the “close” buttons on lifts　　　 .

A. are fake for the convenience of disabled people

B. work only when people press them hard for a while

C. were specially designed to give people a sense of control

D. cannot speed up the process of closing the door in any case

3.The underlined part “for this same purpose” in Paragraph 6 refers to　　　 .

A. making people more patient

B. giving people perceived control

C. helping people to build up confidence

D. making people with depression feel better

4.According to John Kounios, people who press fake buttons　　　 .

A. should give up this habit

B. probably do so to kill time

C. consider what they do to be meaningless

D. don’t know that what they press is fake

高二英语阅读理解中等难度题查看答案及解析

Whenever we see a button, we are eager to press it because we know something will happen. This is true in most cases, for example on a doorbell and on the “on/off” button on the TV. But some buttons are actually fake, like the “close” button on a lift.

Many people are in the habit of pressing the “close” button because they don’t have the patience to wait for the lift doors to shut. But lifts’ “close” buttons are a complete scam (骗局), at least in the US － the doors will not close any faster no matter how hard you press.

It started in the 1990s when the Americans with Disabilities Act was passed in the US, making sure that all lifts stayed open long enough so that people with disabilities could enter. Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.

But to normal lift riders, the buttons aren’t completely useless. According to psychologists, fake buttons can actually make you feel better by offering you a sense of control.

“Perceived (能够感知的) control is very important. It reduces stress and increases well-being,” Ellen J. Langer, a psychology professor, said, “ having a lack of control is associated with depression.”

Experts have revealed that a lot of buttons that don’t do anything exist in our lives for this same purpose. For example, many offices in the US have fake thermostats (温度调节器) because people tend to feel better when they think they can control the temperature in their workplace.

Pedestrian(行人) crosswalk buttons don’t live up to their names either. Pressing them used to help make the traffic signals change faster, but that was before computer-controlled traffic signals were introduced.

But psychologists found it interesting that even when people are aware of these little “white lies”, they still continue to push fake buttons because as long as the doors eventually close, it is considered to be worth the effort.

“That habit is here to stay,” John Kounios, a psychology professor, said. “Even though I have real doubts about the traffic light buttons, I always press them. After all, I’ve got nothing else to do while waiting. So why not press the button in the hope that this one will work?”

1.What was the author’s main purpose in writing the article?

A. To describe some different kinds of fake buttons.

B. To analyze the functions of fake buttons.

C. To explore people’s different habits when it comes to pushing buttons.

D. To explain the advantages and disadvantages of fake buttons.

2.In America, the “close” buttons on lifts _______.

A. work only when people press them hard for a while

B. cannot speed up the process of closing the door in any case

C. are fake for the convenience of disabled people

D. were specially designed to give people a sense of control

3.The underlined part “for this same purpose” in Paragraph 6 refers to _______.

A. helping people to build up confidence

B. making people more patient

C. giving people perceived control

D. making people with depression feel better

4.According to John Kounios, people who press fake buttons ______.

A. don’t know that what they press is fake

B. should give up this habit

C. consider what they do to be meaningless

D. probably do so to kill time

高二英语阅读理解中等难度题查看答案及解析

The accident happened on such an evening with strong winds________by heavy rain.

高二英语单项填空简单题查看答案及解析

The accident happened on such an evening with strong winds 　　　　 by heavy rain.

A.appeared B.happened

C.accompanied D.mixed

高二英语单项填空中等难度题查看答案及解析

听下面一段较长对话，回答以下小题。

1.What happened to the man?

A. He almost drowned himself.

B. He got wet in a storm.

C. He caught a cold.

2.What will the man probably do next?

A. Wash his clothes.　　 B. Go to see a doctor.　　 C. Take a hot shower.

高二英语长对话简单题查看答案及解析

The accident happened on such an evening with strong winds __________ by heavy rain.

A．companied        B．governed          C．accompanied       D．donated

高二英语单项填空中等难度题查看答案及解析