The constraint “In a base relation, NO attribute of a primary key can be null”, is called :

Please listen to the recording and fill in the blanks with 1-3 words. We had a house in Arkansas and we would fly there ____1___ to check on it. And that was always very interesting landing there. The first time we tried it, the landing strip was between a lake and a mountain and the windsock was all ___2___ so we couldn’t see what way the wind was blowing except by looking at the waves on the lake. So that was ____3____ trying to land in that little dangerous spot. But Arkansas is interesting that way. And of course sometimes it could be quite ___4___. I know on one trip back home we came into a storm. That was at San Bernardino and somehow we _____5____ in snow. We were___6___and we didn’t know how to ____7___ there because we had the mountains between us and home. And we had to call on Edwards Airforce Base to get us _____8____. （）

It is an understood fact that water helps mobilize soluble nutrients, transport waste materials and regulates body temperature. 【C1】______ consumption can result in elevated blood pressure and increased amounts of【C2】______in blood. Water also helps in the transportation and 【C3】______of fat cells in the body. Our competitive lifestyles have【C4】______us to eating junk foods containing empty calories of zero nutritional value. This exhausts the natural reserves of nutrients and only ends up【C5】______increased amounts of fat. Natural foodstuffs,【C6】______the human body, are also made up of water. These foods are packed with nutrients in their watery bases and are perfect【C7】______for deep fried and processed foods.【C8】______the inclusion of water-based fruits and vegetables like carrots, apples, water melons, lemon, grapes, kiwi, spinach, cucumber and radishes, one is said to【C9】______as much as 800 calories per day. The logic behind water dense foods is the fact that, they will【C10】______ the body without causing it additional harm. 【C11】______, the nutrients they contain will【C12】______the natural reserves and help make physical functions better. 【C13】______water aids in easier and faster digestion of food, it is responsible for resulting in a high【C14】______. This, in turn, helps in burning fat. However, knowing how much water to consume to【C15】______weight loss is essential. It is believed that every 1 kilogram of body weight requires at least 0.033 litres of water to maintain 【C16】______physical functions. So, an average male weighing 60 kilograms, needs to drink at least 2 litres of water to be able to shed weight 【C17】______. Drinking at least 3 glasses of cold water every morning【C18】______breakfast, will set your metabolism(新陈代谢)【C19】______. This will keep burning the fat cells throughout the day, even【C20】______resting.

【C1】

A．Adequate

B．Inadequate

C．Sufficient

D．Abnormal

Where does Obama make the speech?

A．In a military base in Iraq.

B．In a visit to Washington.

C．In a military base in Texas.

D．In a visit to Baghdad.

A.When using a mksysb to clone a system that has had device driver updates applied, the target system does not need to be updated with device driver Updates to match the source systems level, as the mksysb will have the needed drivers.

B.CHRP architecture systems cloned form non-CHRP architecture systems with Updates applied may fail to boot due to incompatibilities between the updated kernel in the mksysb image and the base level devices.chrp.base.rte fileset installed during the cloning process.

C.If the source and target system kernels are different (for example, rs6k and rspc), one MUST boot from CD-ROM installation media, at the same operating system level as the mksysb being restored.

D.The RECOVER_DEVCIES option allows the choice to recover the customized ODM attributes from the mksysb(for example, network addressing, static routes, tty settings, and multi-port adapter cards). The target devices must be in The same location as the source machine, or the install will fail and the device wil not be defined.

Small, pink and very ugly. Hardly the qualities of a star, but they describe the deformed mouse that was the media darling at a recent science exhibition in Beijing. With a complex tissue structure in the shape of a human ear grafted on to its back, the rosy rodent was a stunning symbol of the serious strides China is making in the field of biotechnology.

China is fast applying the latest life-science techniques learned from the West m aggressively pursue genome research. It's establishing its own centers of technical excellence to build a scientific base to compete directly with the United States and Europe. With a plentiful supply of smart young scientists at home and lots of interest abroad biotechnology is on the brink of a boom in China and in the view of foreign scientists, Beijing is playing a clever hand, maximizing the opportunities open to them.

For the moment, the cooperation exists mostly with Europe and the U. S. But Asia's other biotech leaders, Japan, Singapore and Korea, also are recognizing China's potential as an attractive low-cost base to conduct research. These partnerships--and China's advancement in the field of biotechnology--could help benefit the rest of Asia: China's rapid progress in improving crop yields will address food-security concerns in the region. In addition, China is more likely to focus on developing cheap technology that its predominantly poor population--and those of other Asian countries--can afford.

There remain, however, serious barriers to the development of a strong biotech industry. Among them are a poor domestic legal framework, weak enforcement of intellectual-property rights and loose adherence to international standards. China is a signatory of the International Bio Safety Protocol, which should mean adherence to global standards governing the conduct of field trims. But some observers are skeptical. "The regulations look good, but I haven't met one scientist who believes they are being fully adhered to," says a European science analyst.

If shortcuts are taken, then some of the recent scientific achievements trumpeted in the official press may never make it to market. But no matter how strict lab tests are, other problems lie in wait. For example, there is a number of tasks it would take years to fulfill in the patents office, says one lawyer, leaving innovators with little protection if they take a product to market in China.

The mouse on display is most significant in that ______.

A．it has an ear in the shape of a human ear

B．it is unusually small and ugly as a star

C．it is the focus of. the media at the exhibition

D．it indicates China's progress in biotechnology

In arithmetic the rules of addition are basic, and all the other rules are built on this ______.

A．basis

B．bases

C．base

D．basises