What is cloning? Are there different types of...

What is cloning? Are there different types of cloning?

_____71____ Actually, there are different technologies which can be used for other purpose besides producing the genetic twin of another organism. A basic understanding of the different types of cloning is key to talking an informed stance on current public policy issues and making the best possible personal decisions. The following three types of cloning technologies are usually performed; recombinant DNA technology or DNA cloning, reproductive cloning, and therapeutic cloning.

___72_____

Scientists have been cloning animals for many years. In 1952, the first animal, a tadpole, was cloned. ___73_____ Since Dolly, researchers have cloned a number of large and small animals including sheep, goats, cows, mice, pigs, cats, rabbits, and a gaur. ____74____

Hundreds of cloned animals exist today, but the number of different species is limited. ____75____ Some species may be more resistant to somatic cell nuclear transfer than others. The process of stripping the nucleus from an egg cell and replacing it with the nucleus of a donor cell is a traumatic one, and improvements in cloning technologies may be needed before many species can be cloned successfully.

E.       Cloning is making a genetic copy of something else.

F.       Attempts at cloning certain species such as monkeys, chickens, horses, and dogs, have been unsuccessful.

G.       Before the creation of Dolly, the first mammal cloned from the cell of an adult animal, clones were created from embryonic cells.

高二英语信息匹配中等难度题查看答案及解析

One type of fish is named salmon(大马哈鱼). There are many different kinds of salmon, but almost all of them mate(交配) in a very strange way. They are born in small, freshwater rivers. They live in the river for a year, and then swim downstream to a bigger river and eventually to the ocean very quickly. While they live in the ocean, salmon are silver coloured.

After several years at sea, the salmon grow very long and heavy. Then, as if by magic, they all begin to swim home. Each salmon somehow remembers where it was born and the very same area in the small river.

It is a long, difficult journey home. Once the salmon enter fresh, they stop eating. They also change colours. Some salmon turn red, other brown and grey, and some turn pink. Some salmon grow a large bulge on their back, called a hump. These salmon fight to swim upstream against the current of sometimes very to avoid bears, birds, and fishermen

Finally, the salmon that survive mate in the same river in which they were born. Then, after all that work, they die! These salmon still play an important role. Their dead bodies help to provide nutrition(营养) to the animals that live in and around the river When their eggs hatch, the cycle will start again.

1.Which of the following do salmon NOT do when they reenter fresh water?

A. They change colours.

B. They stop eating.

C. They grow bulges on their backs.

D. They grow teeth.

2.Inferring from the passage, why do salmon eat a lot while they are in the ocean? Because_______

A. they need to have enough energy to return home

B. they never stop swimming

C. they are afraid of bears

D. the different water makes them hungry

3.Salmon return to fresh water in order to _______.

A. mate

B. provide nutrition to other animals

C. mate and provide nutrition to other animals

D. make a difficult journey

高二英语阅读理解中等难度题查看答案及解析

_______ there are many different types of food, some animals spend their lives eating only one type.

A. Since　　　　　　　　 B. Unless

C. Once　　　 　　　　 D. While

高二英语单项填空中等难度题查看答案及解析

_______ there are many different types of food, some animals spend their lives eating only one type.

A. Since　　　　　　　　 B. Unless　　     　　　　 C. Once　　     　　　　　　 D. While

高二英语单项填空中等难度题查看答案及解析

There are varieties of programs in the TV station to ________ many different types of interests and tastes among the public.

A. attend to　　　　 B．appeal to　　　　 C．adjust to　　 D．adapt to

高二英语单项填空中等难度题查看答案及解析

There are several different types of fire departments. Some hire full-time paid firefighters and some are run entirely by volunteers.1., a firefighter must go through strict physical and academic training to ensure a strong knowledge of fire safety and the physical strength to handle the tasks required by member of a fire department.

Joining a fire department requires that both physical and written tests are passed with scores showing a thorough knowledge of fire safety.2..

The first step in joining a fire department as a paid firefighter is to submit an application as well as acquire the appropriate training. Usually firefighters must have a high school diploma, and some complete two-or-four-year programs in fire science at community colleges and universities. 3., and if a candidate already has connections at a fire department, he may apply for a position straight out of high school.

Once a candidate applies and is accepted for training at a fire department, he must then complete several weeks of training at the department’s training center.4.. When this is done, the candidate is sent to a fire company for a period of probation (实习). He has to continue training in the new position while being directed by experienced firefighters.5.. An application must be submitted to the volunteer fire department, then if the application is accepted, the candidate will take a training program and then be required to pass a physical and written test. Firefighters must also become certified (认证) as Emergency Medical Technicians (EMTs). The level of EMT certification is determined by the individual departments.

A.Although it is demanding

B.Whichever type is desired

C.However, an academic program is not required

D.For volunteer firefighters the procedure is similar

E.But joining a volunteer fire department is totally different

F.Training consists of classroom work and practical training

G.Also, a candidate must be able to respond quickly in emergencies

高二英语七选五中等难度题查看答案及解析

Dolphin or not a dolphin?That is the question!You see,there are several types of dolphins.Some are saltwater dolphins while others are river dolphins.

＂What are the 32 types of dolphins?"When people are asking the question,they are actually referring to the saltwater dolphins in oceans and seas.The river dolphins living in fresh water,are not included in these species.But what would be the answer in this case if we ask,"Dolphin or not a dolphin?"The answer would obviously be yes.River dolphins still belong to the dolphin family.

Among the 32 types of dolphins,some do not actually wear the word"dolphin”in their names,such as the tucuxi,while others actually have the word"whale"as part of their names even if they are not whales but in fact,belong to the dolphin family,for example, the melon-headed whale and the killer whale.So what would be the answer to the question＂dolphin or not a dolphin?"in these cases?It would be yes.All these species do belong to the dolphin family.

Another question that people ask is,"Are the sea animals that perform at aquariums all dolphins?"So,it always seems to come back to the question,"Dolphin or not a dolphin?"

Well the answer is no in this case.The sea animals that perform there are not all dolphins. The beluga which people tend to think belong to the dolphin family because they show what seems like a smile,like most dolphins,are in fact a species of the whale family.

Now that you read these facts about dolphins,you probably realize that certain sea animals may appear to be part of the dolphin species and that others seem to be part of the whale family,but in either case,it is not obvious and can be surprising when you identify a sea animal as being a dolphin or not a dolphin.That is the question!

1.What do we know about the majority of the dolphins?

A.They look like whales. B.They appear friendly.

C.They perform for audience. D.They live in fresh water.

2.What could be added about dolphins before the last paragraph if you were the author?

A.The living area. B.Dolphin training.

C.The eating habits. D.Further identification.

3.This article can be classified as_____.

A.popular science B.literary fiction

C.a travel diary D.a news report

高二英语阅读理解中等难度题查看答案及解析

Everyone is born with the ability to learn. There are normally two types of learning in our daily life and study — active learning and passive (被动的) learning. 1. This will help you develop a habit of active learning gradually.

2. I bet that no one sits down to read with the purpose of not getting the contents. But I’m sure that some of you have been in a situation, probably more than once, where you read an assignment, closed the book and thought “what the word was about”. 3. Active readers, on the other hand, set goals and check their understanding as they read. When they finish, they can explain the main points and know that they’ve seen what they have read.

Active learners think about information deeply and critically. Being thoughtful is an important part of active learning, because it means that you are analyzing and absorbing the information. 4. For instance, you may make connections between the new information and what you already know, identify concepts that you may not understand very well, or evaluate the importance of what you are reading. An active learner considers constantly in this way. In contrast, passive learners may read the text and listen to lectures and even understand most of what is read and heard. 5.

All in all, behavior of an active learner and a passive one varies greatly. Equipping yourself with study strategies (策略) of active learners may eventually help you become one of them

A.Passive learners won’t be strict with themselves.

B.You need to know some differences between them.

C.In other words, you are processing what you read.

D.However, that important step of reflecting on it is not taken.

E.Active learners accept much of the responsibility for learning.

F.When interacting with the text in this way, you are doing passively.

G.Active learners study with the purpose of grasping and memorizing information.

高二英语七选五中等难度题查看答案及解析

We have proof that you become what you eat. When you know the effects of different types of food, you can use your knowledge well and eat what you want to become.

Food has an impact on our physical and mental health. Have you ever heard any of the following advice?

Lettuce (莴苣) or milk can make you sleepy.

To stop feeling sleepy you should eat peanuts or dried fish.

Everyone has their own advice to give, which they have read about or have been told by older relatives. Some of these pieces of advice seem to contradict each other.

Eating chocolate makes you fat and gives you spots.

Chocolate contains the essential minerals: iron and magnesium (镁).

What we need to figure out is what type of chocolate to eat to get the benefits and how much of it to eat. We can do this by reading the list of ingredients (原料) on the chocolate bar package. Exactly how much real chocolate is in there? And how much of that do we need to eat to get the benefits of the minerals it contains?

Future restaurants might be named after the physical or mental state they hope to create. Their menus will list the benefits of each dish and drink. Some restaurants have already started this concept, and list the nutritional (营养的) content of their dishes on the menus.

Let’s take the restaurant “Winners” as an example. Their menu would list dishes specifically designed to help you win sports competitions. Or you could choose the Go-faster salad, which is a large bowl of mixed raw vegetables in a light salad dressing, giving you energy without making you gain weight. And what kind of dishes do you think would be on the menu at the “Clever Café”?

So what’s going to happen to hamburgers and biscuits? Will the concept of eating food, because it’s tasty, go out of fashion? Of course not! Junk food is also changing. If ice-cream is not good for children, can’t we give them fat-free, sugar-free tofu ice-cream? Unhealthy food is going out of fashion, so brands are changing. We are told not to drink cola because of the sugar and caffeine content so cola companies are making sugar-free and caffeine-free drinks. We are told dried fruit is a healthier snack than biscuits so some biscuit companies are making biscuits with added vitamins.

1.By saying “you become what you eat”, the writer means that ________.

A．you will become your own food

B．you will know what food is good by its appearance

C．food has an effect on your health

D．you will know the effects of different types of food

2.What does the underlined word “contradict” mean in the text?

A．Oppose to                             B．Help with

C．Have influence on                       D．Benefit from

3.How can we eat chocolate properly, according to the passage?

A．To eat chocolate containing the essential minerals.

B．To read the list of ingredients on the package.

C．To get advice from others before eating real chocolate.

D．To learn how much chocolate we can consume before eating.

4.Which is true about the future restaurants?

A．The food in “Winners” can ensure you to win sports competitions.

B．They might list the nutritional content of their dishes on the menus.

C．Hamburgers will disappear in these restaurants.

D．The Go-faster salad helps you go faster.

5.The concept of eating tasty food will not go out of fashion because ________.

A．the junk food companies are changing their brand names

B．biscuit companies are making dried fruit

C．junk food will become healthier than before

D．Cola companies are still making cola

高二英语阅读理解中等难度题查看答案及解析

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

What is clone? The noun “clone” and the verb “to clone” are not used consistently. In biology a clone is a cell or an organism, which is 1. (genetic) the same as another cell or organism. Many simple organisms such as bacteria reproduce themselves by 2. (copy) their DNA and splitting (分裂) in half. The verb “to clone” refers 3. the process of creating cloned cells or organisms. The process differs, 4. (depend) on the kinds of cells used in the cloning procedure and the desired result. Usually, 5. scientists clone an animal, they take the nucleus (核) of a cell and place it into an egg cell from 6. the nucleus has been removed. The egg cell then divides to produce 7. embryo that develops an animal if the procedures work as 8. (plan). Different from other cloning cases, Dolly was created from a specialized adult cell, 9. from a very early embryonic cell in which no specialized 10. (tissue) begin to develop.

高二英语语法填空中等难度题查看答案及解析