[判断题]Bone contains no water.

[判断题]Bone contains no water.

[单项选择]Although custom prosthetic bone replacements produced through a new computer-aided design process will cost more than twice as much as ordinary replacements, custom replacements should still be cost-effective. Not only will surgery and recovery time be reduced, but custom replacements should last longer, thereby reducing the need for further hospital stays.
Which of the following must be studied in order to evaluate the argument presented above
A. The amount of time a patient spends in surgery versus the amount of time spent recovering from surgery.
B. The amount by which the cost of producing custom replacements has declined with the introduction of the new technique for producing them.
C. The degree to which the use of custom replacements is likely to reduce the need for repeat surgery when compared with the use of ordinary replacements.
D. The degree to which custom replacements produced with the new technique are more carefully manufactured than are ordinary replacements.
E. (E) The amount by which custom replacements produced with the new technique will drop in cost as the production procedures become standardized and applicable on a larger scale.

[填空题]What is the color of bone marrow

[填空题]Obviously, recruiting voluntary bone marrow donors in mainland China is ______.

[单项选择]Fragments of charred antelope bone have recently been found at a million-year-old settlement of Homo erectus, an early human species. This discovery demonstrates that humans were making controlled use of fire to cook meat at a very early stage of their development.
The argument above makes which of the following assumptions
A. Every human species since Homo erectus has made controlled use of fire.
B. Homo erectus could not have eaten antelope meat unless the meat had been cooked.
C. Early human settlements can be identified by the presence of charred antelope bones.
D. The diet of Homo erectus consisted in large part of antelope meat.
E. (E) The antelope bones were charred in a fire controlled by humans.

[填空题]What is the function of bone marrow Its function is to______.

[单项选择]Skeletal remains with animal bone blades tied to the feet testify to skating’s existence as early as 10,000 BC. These remains were found in the Netherlands. Scandinavia is called the mother of skating because of the sport’s popularity there, beginning around 1000AD. Ice skating was primarily a means of transportation at first, although documents from the Netherlands indicate that speed races were held in towns as early as the 15th century.
American athlete Jackson Haines is known as the father of modem figure skating. Haines was born in 1840 in New York City. After studying dance and ballet, he became a dancing master and applied his dancing techniques to figure skating. He performed around the world and became well known for his imaginative and artistic techniques. Haines’ s style was enthusiastically received in Europe and eventually became accepted internationally.
The formation of national and international skating organizations began during the 1890s. In 1892 the Interna
A. American athlete Jackson Haines.
B. Norway’s Sonja Henie.
C. American skater Dick Button.
D. Dutch skater Jaap Eden.

[填空题]How many chemicals does tobacco contains

[填空题]
1. China has launched a campaign to recruit more bone marrow donors, amid a shortage of funds as well as of sibling donors who could help the growing number of patients in need of life-saving transplants, state media reported on Monday.
2. The Chinese Red Cross began the national campaign over the weekend to find donors for some 4 million patients suffering from leukaemia, thalassaemia and other blood diseases and awaiting bone marrow transplants, the official China Daily said. Every year China has 40,000 new leukaemia patients, most of them under 35 and 50 percent of them children, the newspaper said. Other reports have linked China’s growing childhood leukaemia to solvents and building materials used in interior decoration.
3. With a tiny pool of bone marrow donors, weakened by the absence of sibling donors for most children because of China’s one-child policy, doctors rely on