I have often though it would be a blessing(21)_________each human being were stricken blind and deaf for a few days at some time during his early adult life. Darkness would make him more appreciative of sight; silence would teach him the joys of sound.

   Now and then I have tested my seeing friends to discover what they see. Recently I was visited by a very good friend who had just returned from a long walk in the woods, and I asked her what she had observed. “Nothing in particular,” she replied. I (22)_______be suspicious if I had not been accustomed to such responses, for long ago I became convened that (23)____seeing see little.

   How was it possible, I asked myself, (24)__________(walk)for an hour through the woods and see nothing worthy of note? I who cannot see find hundreds of things to interest me(25)_______mere touch. I feel the delight of a flower, and something of the miracle of nature is revealed to me. Occasionally, if I am very fortunate, I place my hand gently in a small tree and feel the happy tremble of a bird in full song. I am delighted to have cool waters of a river (26)_________(rush)through my open fingers.

   To me the feast of seasons is a thrilling and unending drama, the action of (27)_________streams through my fingertips. At times my heart cries out, (28)________(thrill)to see al these things. If I can get so much pleasure by mere touch, how much more beauty must be revealed by sight? Yet, those who, have eyes apparently, see little. The view of color and action that fill the world(29)___________(take) for granted.

   It is human, perhaps, to appreciate little that which we have and to long for that which we have not, (30)________it is a great pity that in the world of light the gift of sight is used only as mere convenience rather than as a means of adding fullness to life.

A. eventually    B. production   C. Negative   D. involving   AB. positive    AC. employing

AD. constantly   BC. response    BD. reverse    CD. relaxation    ABC. function

  By now, how the immune system is affected by stress has been discovered. In one study, ___31___500 couples, those who showed very unfriendly behavior during a 30-minute discussion about marriage problems had lower immune functioning for 24-hour period following the experiment than people who showed less ___32___behavior. It is not just stress that can do damage. One researcher though that if the same cold virus was put under two different noses, the person who is depressed or anxious would be more likely to develop the cold. How can stress and related emotions contribute to poor health?

  These feelings can cause the __33___of substances that damage or weaken our immure cells. Negative emotion can also cause our bodies to produce fewer substances that __34___help fight off disease. If stress, depression, anger and other negative feelings can make you more likely to get sick, can the ___35____be true? Will you have a stronger immune__36___and greater health if you are happier, less stressed? Experts believe that the answer is yes. There are studies showing that by __-37___certain mind-body techniques that help reduce stress and improve outlook, cancer patients can live longer. And cancer patients aren’t the only ones who can benefit. Research has found that when patients with chronic pain use ____38___therapies and other techniques to deal with discomfort, they reduced their visits to the doctors by 36%. Relaxation produces better health through deep rhythmic breathing, muscle loosening and a slower heart rate. When some of the pressure is taken out of the body, they entire immune system will ___39___much better. Relaxation decreases blood pressure and heart rate. That is important because a body that is ___40___under pressure will exhaust.

A. Unfortunately, there aren’t nearly enough trained genetics counselors to handle the coming upsurge in demand for this type of information.

B. Adults cannot do much to alter their biological lot, but what if parents could examine their unborn child’s genome?

C. Cancer has become the first killer these years. That’s why people tend to take overtreatment with the knowledge of family history.

D. Another fear is that a customer without discussing with genetics counselor can receive information via the Internet about a multifold greater risk of breast cancer.

AB. Another problem arises whether it is moral to chose to stop pregnancy because of the genome problem.

AC. Attitudes toward child rearing might change along with the new technology.

1) In a few years you will be able to order a transcript of your entire genetic code for less than $1,000. ____67____Two different university laboratories have developed test that will reveal the entirety of a baby’s genetic code using just a blood sample from the mother plus a drop of saliva(唾液)from the father.

2) Prenatal(出生前的) whole-genome sequencing will provide volumes of information beyond the currently available tests exclusively for genetic disorders such as Down’s syndrome or Tay-Saches disease. The three billion units of code furnished in the new tests will also dwarf(使……相形见的) the relative trickle(零散)of information provided by consumer gene-testing services such as 23andMe, which currently look only at perhaps about one million locations in the genome.

3)____68____Without careful panning, the new prenatal genetics might rob a child of the chance to make decisions best left until adulthood---whether or not to learn, for instance, if a mutation(突变)predicts the inevitability of Huntington’s disease 20 years hence.

4)_____69_____. Similar laissez0faire(放住)action to prenatal whole-genome testing could portend(预示)tragedy.

5)Ultimately certain agency will need to develop a comprehensive policy on prenatal whole genome testing. Bioethics scholars wrote an analysis last summer that calls on the medical community to develop a guide to the most relevant genomic data for future parents. ___70___Without access to a much higher level of refined expertise, the secrets of our offspring’s genetic code will continue to remain an unnerving cipher---or worse.

Rocks Tell Time

Earth’s surface is constantly changing, and its rocks are evidence of past geologic events. The age of rocks can be determined in various ways. By using relative-dating principles and noting the position of layers within a rock, it is also possible to reconstruct the sequence(顺序)of geologic events that have occurred at a site.

One way scientists do this is by using the principle of uniformitarianism, which states that the processes affecting the earth today are the same ones that affected it in the past. For example, at an active volcano, today, lava can be observed to cool and form layers of basalt(玄武岩). Therefore, any time one sees layers of basalt, it can be assumed that they likely formed from lava cooling after a volcanic eruption.

Second, the principle of original horizontality states that most sedimentary(由沉淀物所生成的)rock is deposited in a horizontal position, which means they form layers. The principle of superposition can be used to interpret the relative ages of these layers: In a sequence of undisturbed sedimentary layers or lava flows, the oldest layers are at the bottom. These principles allow scientists to determine the relative age of a rock compared with another rock. They can also compare the ages of rock layers in different areas. This type of comparison has enabled them to create a list of earth’s rock layers from youngest to oldest, called a geologic column.

Another way to test a rock’s age is by using radioactivity. Radioactive parts of elements in rocks decay into other elements at a constant pace called a half-life. By comparing the amount of the originai element with the amount present today, scientists can come up with an absolute age for a rock. These ages are compiled into a history of earth. Long stretches of time on earth are called eras. Earth’s rock history includes the Paleozoic, Mesozoic, and Cenozoic eras.

The scientists who interpret the stories told by rocks are called structural geologists and stratigraphers(地层学家). Structural geologists carefully observe and interpret layer of rock. They study the way in which the earth’s crust is deformed by mountain-building processes. They also study clues at the earth’s surface that reveal the underlying structure and geologic history of an area. Stratigaphers compare vertical sequences of rock layers form different areas to piece together the geologic history of a region.

71._____________________________

72．在我看来，中国人是世界上最喜欢谈论国内外大事的民族。 （opinion）

73．就像汽车的发明在很大程度上加快了我们的生活节奏，网络的出现亦是如此。（As）

74．这双鞋虽然很贵，但穿起来舒服，而且耐穿，正是应证了一分钱一分货这句话。（wear）

75．在高中毕业的这一刻，回首往事，我再怎么感谢师长的教诲、同学的帮助和学校的包容都不为过。（too）