题目内容
（请给出正确答案）
A、higher than 5% glucose solution
B、lower than 5% glucose solution
C、equal to 5% glucose solution
D、none of above
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【填空题】AV Clip 5: The Importance of Water Listen to a passage three times and while listening, you are to put the missing word in each numbered blank according to what you hear. Experts say water is important for many reasons. Between fifty-five and seventy-five percent of the body is water. Water in blood carries (1)__________ and antibodies through the body. Water in urine carries away waste materials. Water is needed for (2)_________ the body on hot days, and when we are working or exercising. Water carries body heat to the surface of the skin. There, the heat is lost through (3)____________. Health experts say adults should drink about two liters of water a day to (4)________ all the water lost in liquid wastes and perspiration. They say people should drink more than that in hot weather. Experts say it is important to drink before, during and after (5)________. They say we should drink water even before we start to feel like we need something to drink. During hot weather, cool liquids are best. Also, (6)________ sweet drinks and alcohol. We need to add that doctors also say it is possible to drink too much water. Some people, for example, do this if they exercise hard during a (7) _______ wave. Experts with the Mayo Clinic say drinking too much water can cause hyponatremia. In this condition, the level of (8) ______ in the blood falls too low. The result is that the amount of water in the body increases. This causes cells to become larger. Mayo Clinic experts say the (9)________ cells can cause a person to become sick or (10)________. They also can interfere with mental ability, make (11)________ weak and cause pain in the head. In a mild case, simply reducing fluids may be all that the person needs. But medical help is necessary if the condition is more(12) _________.
Researchers conducted an experiment using freshly slaughtered ostriches to prove that
A．soft tissues pre-soaked in blood and put in saline solution won"t disappear.
B．reactive ions interact with organic tissues to form. abnormal chemical bonds.
C．iron from blood cells has great influence on the preservation of animal tissues.
D．proteins tied in knots are unrecognizable to bacterias that would consume them.
A、A. D and G cells
B、B.Parasites
C、C.Leukocytes
D、D.A and C cells
To make human cells more mouselike scientists tried ______.
A．to subject them to two more genes
B．to keep the division from slowing down
C．to promote the production of telomerase
D．to prevent excessive ceils copying
A、Histamine, gastrin, and acetylcholine are three physiological agonists for HCl secretion.
B、H2 receptor blockers can block most HCl secretion evoked by gastrin or or acetylcholine.
C、Truncal vagotomy will abolish the gastric phase of HCl secretion.
D、Early in the intestinal phase, HCl secretion is stimulated by gastrin released from G cells in the duodenum and upper jejunum.
听力原文： Trees have a spectacular survival record. Over a period of more than 400 million years, they have evolved as the tallest, most massive and longest-lived organisms ever to inhabit the Earth. Yet trees lack a means of defense that almost every animal has: threes cannot move away from destructive forces. Because they cannot move, all types of living and nonliving enemies—fire, storm, micro-organisms, insects, other animals and later, humans—have wounded them throughout their history. Trees have survived because their evolution has made them into a highly compartmented organism; that is, they wall off injured and infected wood.
In that respect trees are radically different from animals. Fundamentally, animals heal: they preserve their life by making billions of repairs, installing new cells in the positions of old one. Trees cannot heal: they make no repairs, instead, they defend themselves from the consequences of injury and infection by walling off the damage. At the same time they put new cells in new positions; in effect they grow a new tree over the old one every year. The most obvious results of the process are growth rings, which are visible on the cross section of a trunk, a root, or a branch.
(30)
A．Tall.
B．Green.
C．Massive.
D．Long-lived.
Testimony at a US Senate hearing on 5 March debated a bill proffered by Republican Senator Sam Brownback (Kansas) that would impose criminal penalties on all attempts at transferring a human somatic cell nucleus into a human egg, whether the purpose was to create an infant (usually called reproductive cloning) or to derive embryonic stem cells for disease research (usually called therapeutic cloning.) The US House of Representatives passed a similar total ban last year. Two other bills have also been introduced into the Senate; both would ban reproductive human cloning but permit therapeutic cloning.
Meanwhile, President Bush is expected to fill the long-vacant top job at the National Institutes of Health this week with Elias Zerhouni, executive vice dean of the Johns Hopkins University School of Medicine in Balthnore. For several months the front-runner for NIH director had been AIDS expert Anthony Fauci, head of the National Institute of Immunological Diseases and Stroke. The campaign against Fanci was led by Brownback, who regarded him as insufficiently pro-life. Zerhouni is said to have endorsed Brownbacks anti-cloning bill in writing.
The Bush administration also proposed last week that the United Nations adopt a Brownback type worldwide ban on human cloning, including therapeutic cloning. The UN is considering prohibiting reproductive cloning, but delegates from Europe and Asia oppose interfering with cloning to produce embryonic stem cells for research.
The US Senate hearing starred Christopher Reeve, Hollywood's former Superman, a persuasive high-profile advocate for stem cell research who is handsome as ever, but paralyzed from the shoulders down and unable to breathe on his own because of a riding accident some years ago. Testifying against the Brownback bill, Reeve told the hearing that only human embryonic stem cells carrying his own DNA offered hope for remyelinating his devastated spinal nerves via an immunologically compatible cell transplant. Also testifying against the bill was the hearing's scientific star, Nobel laureate Paul Berg of Stanford University. Berg argued that human stem cells not only could solve the problem of transplant rejections, they also could provide a unique source of information about common chronic late-onset diseases such as cancer. Studying cells from young people carrying mutations that predispose them to complex disorders could illuminate the disease process and generate clues to prevention or cure, he said. As both these applications are based on transfer of particular nuclei into human eggs, he pointed out, none of the existing 78 human embryonic stem cell lines President Bush approved for federally funded research last summer would be useful either for complex disease research or for compatible transplants.
Berg also objected strongly to both the Brownback and the House bills' ban on importing therapies based on human embryonic stem cell research done elsewhere in the world. That would prevent 280 million Americans from taking advantage of treatments developed in nations such as the UK where some of this research is permitted, he pointed out. It might even mean that Americans who seek such treatments abroad could be arrested and fined when they return, he predicted.
Both Reeve and Berg have suggested that a comprehensive ban on human cloning would put US scientists at a competitive disadvantage. The US would take a giant step backward in research leadership, Reeve noted, and anyway the work would be done abroad, for example in Europe. "Those are not rogue nations behaving irresponsibly," he told the Senate. Berg has said that h
A．Both reproductive and therapeutic cloning
B．Reproductive cloning only
C．Therapeutic cloning only
D．Neither reproductive nor therapeutic cloning
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