Is there intelligent （有智力的）life on other planets？For years，scientists said"no．"or"we don't know．"But today this is changing．Seth Shostak and Alexandra Barnett are astronomers（天文學家）．They believe intelligent life exists （存在）somewhere in the universe．They also think we sill soon contact these beings（人；生物）．
Why do Shostak and Barnett think intelligent life exists on other planets？The first reason is time．Scientists believe the universe is about 12 billion years old．"This is long enough for other planets to have intelligent life，"say Shostak and Barnett．The second reason is size-the universe is huge．"Tools like the Hubble Telescope（哈勃望遠鏡）have shown that there are at least 100 billion galaxies，"says Shostak．"And our galaxy，the Milky Way，has at least 100 billion stars．Some planets going around these stars might be similar to Earth．"
In the past，it was hard to look for signs of intelligent life in the universe．But now，powerful telescopes（高倍望遠鏡）allow scientists to discover smaller planets-the size of Mars or Earth-in other solar systems．These planets might have intelligent life．
Have beings from space already visited Earth？"Probably not，"says Shostak．"It's a long way away．However，intelligent beings may contact us in other way，such as radio signals（信號）．In fact，they may be trying to communicate with us now，but we don't have the right tools to receive their messages．However，this is changing．By 2025，we could make contact with other life forms in our universe and we might help each other．"
（1）Seth Shostak and Alexandra Barnett areAA．
| A．astronomers | B．farmers | C．singers | D．drivers |
C
C
A．The Age and Size of Earth
B．Our Galaxy：The Milky Way
C．Why Intelligent Life Might Exist
D．Earth：The Only Planet with Intelligent Life
（3）Why was it hard to look for signs of intelligent life in the universe in the past？
B
B
A．There were not any smaller planets．
B．There were not any powerful telescopes．
C．The astronomers were not interested in them．
D．The Milky Way didn't exist at that time．
（4）Why haven't beings from space visited us yet according to Shostak？
B
B
A．They're afraid of us．
B．It's a long way away．
C．They don't want to see us．
D．They don't know how to use radio signals．
（5）What does the underlined phrase"life forms"in the last paragraph mean？
C
C
| A．Messages B．Tools | C．Intelligent beings | D．Radio signals． |
【考點】環(huán)境保護．
【答案】A；C；B；B；C
【解答】
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發(fā)布：2024/4/20 14:35:0組卷：155引用：3難度：0.9
相似題
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1．According to a recent report，about 15% of the people in the UK are members of gyms.But are they more likely to be fit？
A study found that gym members were 14 times more active than people who didn't belong to any health club.Gym members did six hours more exercise a week，and this activity did make them fitter than non- gym members.They also spent less time sitting down every day than non- gym members.The results were the same for men and women.
The study included 405 people between the ages of 30 and 64，and the main characteristics of those who were gym members were the same as those who were not. "But gym members did more training than non-gym members，" said the lead author，Elizabeth Schroeder of the University of Illinois.While it might seem clear that gym members exercise more and are healthier than non-gym members，Schroeder says this has not been directly shown before.However，the study is only designed to show a tie between gym membership and more exercise.It may be that active people like to join gyms.In the study，people who exercised as much as gym members were also in good health.
You can get the same benefits wherever you exercise.This study shows a gym membership can make you do more exercise，but other research shows that exercising outside has other help.Outdoor activity can make you feel happy about life，especially if you run through a forest.
Outdoor exercise is also more interesting than going to the gym.The first five minutes of outdoor exercise is especially helpful in making people feel good.But Schroeder says that a gym may also encourage greater exercise because it can be social and fun.
（1）What did the new study find out？
A．British people are crazy about the gym.
B．Gym exercise is better than outdoor exercise.
C．Gym membership can make us healthier.
D．Gym is necessary for our daily life.
（2）In the study，researchers studied.
A．people between aged 30 and 64
B．the same number of men and women
C．405 gym members
D．people with the same characteristics
（3）The study is aimed to build a tie between and .
A．active people；more gym exercise
B．more exercise；health
C．gym membership；more exercise
D．happiness；more exercise
（4）Which statement will Elizabeth Schroeder agree with？
A．Women should do more gym exercise.
B．We should be careful with outdoor training.
C．Outdoor exercise is better than gym exercise.
D．We may make great exercise if we go to the gym.發(fā)布：2025/1/5 9:30:5組卷：1引用：1難度：0.2 -
2．Is it possible to have a diet that s both healthy and friendly to our planet？Here are answers to your eco-friendly food questions.
Does what I eat influence climate change？
Yes.The world's food system is responsible for about one quarter of the planet -- warming greenhouse gases that humans produce each year.That includes raising and harvesting all the plants，animals，and animal products we eat，as well as processing，packaging，and shipping food to markets all over the world.
Which foods have the largest influence？
In general，beef and lamb have the biggest climate footprint per gram of protein while plant- based foods like beans，rice，corn and wheat have the smallest influence.Pork，chicken，eggs are somewhere in the middle.
Is there a simple food choice I can make？
Studies have shown that people who eat a meat-heavy diet can reduce their food- related footprint by one third or more by moving to a vegan diet- no meat，dairy，or eggs.If you don't want to go that far，just eat less meat.
Can I really make a difference to our planet
We need more food to feed the world's growing population.One person alone can make only a tiny djye.aiference.If many people make changes to their diets，that will start to add up.It will make a greater difference if the world's heaviest meat eaters make some changes to their diets.
（1）According to the passage，which foods have the smallest influence on our planet？
A．Beef and lamb.
B．Rice and corn.
C．Chicken and pork.
D．Beans and beef.
（2）According to the passage，which of the following is TRUE？
A．One person alone makes no difference to our planet.
B．Shipping food all over the world has no influence on climate change.
C．All the planet-warming greenhouse gases come from the food system.
D．Meat eaters can reduce their food-related footprint by eating less meat.
（3）What is the best title for the passage？
A．How to produce more meat
B．How to make more plant-based foods
C．How to eat better for the planet
D．How to ask eco-friendly food questions發(fā)布：2025/1/5 9:30:5組卷：0引用：1難度：0.2 -
3．Many countries are fighting with food waste.What are they doing to stop it？
（1）According to the"N-1" formula，if there are 5 Chinese people at your table，you only order
China has been starting a nationwide campaign called "Clear Your Plate" since 2013.This year，some restaurants are encouraging people to order food using the formula "N-1"."N"stands for the number of diners at a table.If there are 6 people at your table，you only order 5 dishes. 
In 2016，France passed a law that stops grocery stores from throwing away unsold food.If it's still safe to eat，the food must be given away to charity；If not，it goes to farmers for use as animal feed. 
In 2019，the US said it encourages food companies to use the phrase "best if used by" for date labeling.This helps shoppers better understand that they don't need to throw food out after the printed date passes if the food is stored correctly. 
In Japan，there are many food banks.People and grocery stores can give away some food to them and they will provide the food to those in need. 
In 2016，South Korea started to ask people to pay fees for throwing away food.There are scales' on trash bins that are used to weigh the food.One ton of food waste costs 1.5 million won （8，700 yuan）. dishes.
A．4
B．5
C．6
D．7
（2）Which of the following is TRUE according to the passage？
A．In France，people and grocery stores can give away some food to food banks.
B．The US passed a law to stop grocery stores from throwing away unsold food.
C．Japan has been starting a nationwide campaign called "Clear Your Plate".
D．People in South Korea are asked to pay fees for throwing away food.
（3）Where does this passage most probably come from？
A．The advertisement.
B．The newspaper.
C．The guide book.
D．The science book.發(fā)布：2025/1/5 9:30:5組卷：3引用：1難度：0.2