根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Question: I have been learning English for about 7 years. 1.________ And I still can’t make myself understood in English. However, I love learning English. How can I learn English well? Please help me.

Answer: Many people have asked me this question. 2.________ Here I will give you several tips for learning English.

●3.________

First of all, you must want to learn. If you are not interested in learning English, no class will help you and no book will help you. So you have to be honest with yourself. Ask yourself, “Do I really want to learn English?” If you can’t answer “yes” to this question, it is better for you to set English aside until you’re ready and willing to learn.

● Set goals (目标).

To learn English well, you must set some goals. 4.________ It will also help you to see your progress. Ask yourself, “What are my goals? What areas would I like to improve?” Think about what your goals are, and review once in a while to see that you are making progress toward your goals.

● Practice, practice, and practice.

After you have set your goals, you have a better idea of what you need to practice. Just like the athlete whose goal is the Olympics must train daily, you as a language learner must practice language every day to make progress toward your goal. 5.________

A. Want to learn.

B. I think it is not easy to learn it well.

C. Make friends with some Americans online.

D. Reading is a very good way to learn new words.

E. The answers are as different as the people asking the question.

F. The more you practice, the more progress you will make.

G. Having goals will help you remember what areas you want to work on.

"Over the years the unthinkable has become thinkable and today we sense we are close to being able to alter human heredity ?#)." These were the words of David Baltimore of the California Institute of Technology, on December 1st, when he opened a three-day meeting in Washington to discuss the morality and use of human gene editing. Dr Baltimore is an old hand at these sorts of discussions, for he was also a participant in the Asilomar conference, in 1975, which brought scientists together to discuss a safe way of using the then-new tcchnology of recombinant DNA, and whose recommendations influenced a generation of biotechnology researchers.

Four decades on, the need for a similar sort of chin-wag has arisen. The International Summit on Human Gene Editing has been held by the national scientific academies of three countries — America, Britain and China. They are particularly concerned about whether gene editing should be used to make heritable changes to the human germ line, something Dr Baltimore described as a deep and troubling question. Like those of Asilomar, the conclusions of this meeting will not be binding. But the hope is that, again like Asilomar, a mixture of common sense and peer pressure will create a world in which scientists are trusted to regulate themselves, rather than having politicians and civil servants do it for them. The meeting is being held against a backdrop of rapid scientific advance, Since 2012 research into a new, easy-to-use editing tool called CRISPR-Cas9 has blossomed. This technique involves a piece of RNA (a chemical messenger, which can be used to recognise a target section of DNA) and an enzyme (酶) called a nuclease that can snip unwanted genes out and paste new ones in.

Public interest was aroused in April, when Chinese scientists announced they had edited genes in non-viable ( 无活力的) human embryos, and again in November when British researchers said they had successfully treated a one-year-old girl who had leukaemia ( 白血病), using gene-edited T-cells. T-cells are part of the immune system that attack, among other things, tumour cells. The researchers altered T-cells from a healthy donor to encourage them to recognise and kill the patient's cancer, to make them immune to her leukaemia drug, and to ensure they did not attack her healthy cells.

In another recent development, a firm called Edit as Medicine, which is based in Cambridge, Massachusetts, has said it hopes, in 2017, to start human clinical trials of CRISPR-Cas9 as a treatment for a rare genetic form of blindness known as Leber congenital amaurosis (伯氏先天性黑蒙). Though other companies are already testing gene-editing therapies, these employ older, clunkier forms of the technology that seem likely to have less commercial potential. Moreover, researchers at the Broad Institute, also in Cambridge, said this week that they had made changes to CRISPR-Cas9 which greatly reduce the rate of editing errors — one of the main obstacles to the technique's medical use.

On the subject of germ-line editing, Eric Lander, the Broad's head, told the meeting it would be useful only in rare cases and said it might be a good idea to "exercise caution? before making permanent changes to the gene pool. The need for caution is advice that might also be heeded by those pursuing work in animals other than people, and in plants — subjects not being covered by the summit.

1.Which ofthe following is TRUE about CRISPR-Cas9?

A. It has fewer side effects.

B. It can modify human gene.

B. It can protect immune system.

D. It has less commercial potential.

2.The underlined word "chin-wag" in Paragraph 2 can be replaced by______

A. discussion B. negotiation

C. argument D. comparison

3.What can be inferred from the passage?

A.Dr. Baltimore started his research on modiffing gene in 1975.

B. Scientists' opinions about the use of gene editing are consistent.

C. CRISPR-Cas9 has been applied to cure Leber congenital amaurosis.

D. More research should be made before the technology comes into wide use.

4.This passage is most probably a______.

A. science fiction B. scientific report

C. conference summary D. commercial advertisement

A new graph has revealed exactly how long you’11 need to sweat it out in the gym to neutralize (抵消) swallowing a favorite fast food.

While eating fried chicken, pizza and burgers will all entail a gym session of over an hour doing cardio(有氧运动)or lifting weights, women have it far harder than men and must work extra hard to banish calorie-packed meals.

After a classic McDonald's favorite, the Big Mac, men would need to do 42 minutes of cardio or 57 minutes of weightlifting.

As for women, fifty one minutes of cardio would help counter the 24 grams of fat in a Big Mac---over a quarter of the recommended daily allowance - --or an hour and eight minutes of weightlifting.

However, the 450g Tesco chocolate cake was by far the worst offender. Clocking in at a whopping 1,710 calories and 90 grams of fat, only a hardcore gym session is going to shift the calories you’ve absorbed from this dessert. The average woman would have to lift weights for almost four hours to work off the calories in this cake.

Comparatively a chocolate bar seems healthy, with 237 calories which would take 25 minutes for the average woman to run off. Alternatively you could spend thirty three minutes doing weightlifting exercises.

Men will have to complete 40 minutes of cardio and 53 minutes of weightlifting while women will have to complete 48 minutes of cardio and 64 minutes of weightlifting against the calories in French fries.

1.The fat of the recommended daily allowance for women is _________grams.

A .18 B. 20 C. 24 D. 30

2.According to the passage, __________is the unhealthiest food.

A. French fries B. the Big Mac

C. a chocolate bar D. Tesco chocolate cake

3.Compared with men, women must spend ________to consume the calories in French fries.

A. 11 more minutes lifting weights

B. 8 less minutes doing cardio

C. 8 more minutes lifting weights

D. 11 less minutes doing cardio

4.The main purpose of the passage is to___________.

A. inform us to stay away from fast food

B. offer us advice on how to keep healthy

C. tell us some information about fast food

D.suggest what we do to work off the calories

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Teenagers are especially likely to suffer loneliness. Here are some suggestions for speeding a recovery from loneliness.

Reach out to others, but start small. A smile and a friendly greeting for the student behind you in line at the cafeteria won’t make you best friends. 1. It also can make it easier to interact the next time.

Find a safe place to make connections. If going to the school dance makes you feel like you just don’t belong, try joining a special-interest group. Maybe it’s the drama club or the marching band 2. .

Find other ways of making connections. Lonely people hunger for acceptance and friendship. Sometimes feeling accepted and liked comes more easily when you do something for others. 3. Teach a child in reading. Take notes for a disabled classmate. You might be surprised at the connections you make after reaching out in these ways.

4. Loneliness is an absence of quality friendships, not of a particular quantity of friends. That’s why it’s important to know how to select a friend. The best friendships are those based on similar values and attitudes.

You get what you expect, so expect the best. If you expect others to be friendly, you will behave in similar ways.

5. It goes away as teens learn how to find their way through their social world and connect with others.

A. But it will make you both feel pretty good.

B. So consider becoming a volunteer.

C. Some teens aren’t so adaptable, however.

D. Encourage people to be friendlier to you.

E. Choose the right people.

F. For most young people, loneliness is only temporary.

G. Look for a group that allows you to ease in gradually.

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