Although the first part of the book is easy, the rest ______.
A:are difficult B:has proved difficult C:is supposed difficult D:have been found difficult
New Technique Promises Earlier Cancer Detection
A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massachusetts Institute of Technology have devised a novel method of 【51】 changes in the nucleus of cells in the earliest stages of the disease." More than 85 percent of all cancers originate in the epithelium (上皮) that lines the internal surfaces of organs 【52】 the body. Although these are treatable 【53】 they are diagnosed in one of the preventable stages, early body damages are almost 【54】 to detect," said scientist Feld. " We present a new optical-probe (光学探子) technique based on light-scattering spectroscopy (分光镜检查) that is able 【55】 detect precancerous and early cancerous cells in cell-rich epithelia," he added in a statement.
The new technique relies on the fact 【56】 cell nuclei change in the early stages of cancer and the differences scatter light in a characteristic way. Until now the changes were only detectable 【57】 a biopsy (活检) was taken, the scientists said. The new technique, 【58】 in the science journal Nature, can be used in conjunction with a routine cancer screening and surveillance technique which uses an endoscope (内窥镜) —a flexible optical probe 【59】 with cameras which is inserted into a cavity in the body—to check 【60】 cancers.
The scientists said they 【61】 their new technique in four different organs during routine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 【62】 , the scientists said. " Our results show that light-scattering spectroscopy has the potential to detect pre-cancerous body damages and preinvasive cancers throughout the body. This technique should 【63】 improve the efficiency of cancer screening and surveillance," the scientists said. Cancer is one of the biggest 【64】 in industrialized countries. 【65】 to figures from the World Health Organization, 10 million people were diagnosed with the disease worldwide in 1997 and six million died.
A:before B:after C:although D:near
? ?阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ?
? ?{{B}}What Is Anthrax (炭疽)?{{/B}}
? ?There’s been a lot of
talk about anthrax on the news lately. Some people are worried that anthrax may
be connected to terrorist attacks or that terrorists may spread the germ
that______(51) the disease. Federal officials and police are investigating this
and taking______(52) to protect us.
? ?In the meantime, it’s
important not to panic over anthrax. The chances that you and your
family______(53) at risk are very tiny. One of the ways you can feel better is
to learn about anthrax. When you know what it is and______(54) you can get it,
it doesn’t seem quite as scary.
? ?So, what______(55) is
anthrax?
? ?Here are the facts on anthrax:
? ?Anthrax
is a bacterial infection caused by a germ. Although it’s most common in farm
______(56), like sheep, cows, pigs, horses, and goats, there’s a very small
chance that people can get it, too.
? ?Anthrax spores (孢子) (a
version of the germ in a protective shell that can live in the soil for years)
cause the disease.
? ?People may get anthrax if they are exposed to
anthrax______(57). But here’s the important part: just being exposed to these
spores doesn’t mean that a person will get ______(58).
? ?For a
person to get sick, he would have to breathe in thousands of these spores all
the way into his______(59). Or he’d have to eat meat contaminated with anthrax
or handle______(50) that has anthrax spores. This may sound scary, but even when
a person comes______(61) contact with the spores, it’s unlikely that he’ll get
sick. ______(62) the bacteria do not get into the skin, digestive tract, or
lung, the disease won’t develop.
? ?Anthrax is not spread from
person to person the way the flu can spread from family member to______(83)
member or classmate to classmate.
? ?Anthrax can almost always be
successfully treated with antibiotics (抗生素).
? ?Anthrax is very
rare. Until recently, anthrax wasn’t even talked about because it was so rare —
and it still______(64)! Even with all of the anthrax cases you are hearing about
right now, a person’s chances of getting anthrax are about the______(65) as they
were before you heard about anthrax on the news — very, very
low. |
A:Unless B:I C:Although D:Before
Although it is raining,are still working in the fields.
A:they B:but they C:and they D:so they
Although they meet with difficulties, I hear that they’ve succeeded（）.
A:in all B:after all C:above all D:first of all
单选题
