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Why may the repair process of the DNA finally fail？
A．Because shortwave radiant energy breaks the strands of the DNA.
B．Because the DNA may produce a colony of cancer cells.
C．Because enzymes work to rearrange the DNA into a new order.
D．Because the patient is exposed to UV from time to time.
答案
更多“Why may the repair process of the DNA finally fail？A．Because shortwave radiant energy brea”相关的问题
第1题
Why does the repair process of the DNA may finally fail？
A．Because short-wave radiant energy breaks the strands of the DNＡ.
B．Because the DNA may produce a colony of cancer cells.
C．Because enzymes work to rearrange the DNA into a new order.
D．Because the patient is exposed to UV form. time to time.
第2题
Why may the repair process of the DNA finally fail？
A．Because short wave radiant energy breaks the strands of the DNA．
B．Because the DNA may produce a colony of cancer cells.
C．Because enzymes work to rearrange the DNA into a new order.
D．Because the patient is exposed to UV from time to time.
第3题
Why may the repair process of the DNA finally fail？
A. Because shortwave radiant energy breaks the strands of the DNA.
B. Because the DNA may produce a colony of cancer cells.
C. Because enzymes work to rearrange the DNA into a new order.
D. Because the patient is exposed to UV from time to time.
第4题
Why are some scientists interested in studying aging problem？
A．They want to increase the general ability of our bodies．
B．They may be able to find a better way of our life．
C．If they can pin down the biochemical process that makes us age, there will be hope for extending the length of life．
D．They want to find out if there is a link between how efficiently a cell could repair itself and how long a creature lives．
第5题
听力原文： Hello, this is Jack in technical services. I am calling you to let you know that we were able to fix the problem with your computer. It should no longer randomly reboot. We would like to return your computer today. Please email or call me at 386-2626. If I'm not available you can also contact Lisa, our coordinator, at 386-2489 to let us know what time would be convenient. Or you may stop by the service desk and speak with Bob.
Why is the call being made？
A．To inform. on the status of the problem.
B．To request a reply.
C．To place an order.
D．To repair the computer.
第6题
Why couldn't the woman find the repair shop？
A. She missed the right turn.
B. The man gave her the wrong directions.
C. She was a bad driver.
第7题
Tomas Rodriguez
65 Econo Lane,
Lexington, VA 24450
Phone: (801)225-8649
October 21
Arcadian Clock Co.
Warranty Department
6531 West Board Street,
Richmond, VA 23230
To whom it may concern,
As my watch (model: 5M43-0B19, S/N: 6D8256) was clearly in need of repair, I recently took it to the Lexington Repair Center where the defective components in the watches are repaired. To my surprise, my request for the repairs to be billed to your company was declined in spite of the fact that there are still three years remaining in the coverage period. As there are no other authorized service centers in my area, I decided to pay for the repairs myself.
The following are the charges billed by the service center:
Parts:
New mainspring...........$23
New hour hand.............$8
New battery...................$5
Labor.............................$34
Total..............................$70
Showing prices including tax
I have included a copy of the receipt I got for the repairs and a copy of my warranty certificate. Please let me know if you need any additional information.
Regards,
Tomas Rodriguez
Warranty Certificate
Thank you for purchasing the 5M43-0B19 automatic watch. We are proud of our reputation for quality and customer service and our long history of providing fine timepieces to avid collectors around the world.
To maximize the performance of our products, Arcadian clocks and watches are made with the highest-quality materials available. However, should the product malfunction within five (5) years of the date of purchase due to a mechanical defect, we will cover the cost of repairs. Please note, however, that this warranty covers the cost of parts and labor only. Shipping, insurance, and batteries may not be claimed under this warranty.
In the event that the product requires repair or some other service, please take or ship it to one of the Arcadian's authorized service centers. The centers are equipped with state-of-the-art equipment to provide our customers with a wide variety of repairs and services that are performed according to Arcadian's professional standards. Please see the enclosed list of authorized Arcadia distributors and service centers in your country.
Why did Mr. Tomas Rodriguez write the letter？
A．To request a replacement for his broken watch
B．To request a copy of his warranty certificate
C．To ask for repayment of his expenses
D．To complain about an error on his bill
第8题
Why can't the store repair the recorder for free？
A．The man bought the recorder in another store.
B．His warranty has run out.
C．The recorder is beyond repair.
D．The recorder has been repaired.
第9题
Why Do Many Female Athletes Fall Victim to Knee Injuries？
Rebecca Lobo, a basketball star, grabbed a rebound during the first seconds of game in June 1999. (1) . A pain shot from her knee and drove Lobo to the floor. Tests revealed that Lobo had tom her anterior cruciate (十字的,交叉的) ligament (韧带), or ACL, resulting in the end of her play for the season. (2) .
Lobo, perhaps the most recognized player in the United States, is one of a growing number of female athletes suffering ACL injuries. Experts say that female athletes in middle school, high school, college and professional sports may be eight times as likely as male athletes to experience ACL injury.
(3) . Why are so many female athletes falling victim to ACL injuries？
Sports physicians say one reason is the growing number of females involved in high-impact sports, such as soccer and basketball. Jeff Bauer, a biochemist, however, thinks bone size plays a key role. He examined the knee joints of skeletons of 200 humans who had died at an early age.
Studies of the skeletons of 100 males and 100 females showed in measurement after measurement that the bones making up a female's knee are smaller than those of a male of the same size. Smaller bone surfaces may lead to an increase in stress placed on the ACL during sharp movements, such as turning, jumping, or stopping.
Bauer thinks the size difference may be the primary reason that females injure their knees more often than males do with the same amount of training and experience. "Now, that's not bad, "adds Bauer, "and it's not good. It's just different."
Following the knee injury, Lobo underwent surgery. (4) . After the surgery, the patient needs months of physical therapy to strengthen the knee muscles and ligaments. Eight months after having knee surgery, the patient still needs to exercise her knee every day.
(5) . They also recommend that players do stretching exercises before a game or a practice to help keep the knees flexible and more able to withstand stress during play.
A. When she landed, she tried to stand firm but couldn't.
B. One of the more common techniques used to repair a torn ACL involves replacing the entire ligament.
C. Sports injury experts say knee exercises may help protect knees from ACL injury.
D. Practice before and after a game is a good way to avoid injuries to knees.
E. Thousands of female athletes have suffered a fate similar to Rebecca's.
F. The ACL is a short band of tissue that keeps the knee stable during movement.
(1)
