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These are common materials______we are all familiar.A．about whichB．of whichC．with whichD．t

These are common materials______we are all familiar.

A．about which

B．of which

C．with which

D．to which

提问人：网友stlzlg 发布时间：2022-01-06

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更多“These are common materials____…”相关的问题

第1题

听力原文： Piglets may be happy wallowing in the mud, but they get a much better start in l

ife ff they are nurtured on a warm waterbed. Instead of snuggling up to their mothers for warmth in their cold pigsty and running the risk of being crushed—a common cause of early death—German scientists said waterbeds could be a safer alternative.

When Martin Ziron and researchers at the Institute of Animal Breeding and Genetics in Giessen, Germany tested various heating methods on 1,400 piglets during their first weeks of life, waterbeds won hands down.

"Around 99 percent of the piglets preferred warm waterbeds to any of the alternatives, spending well over half the day lounging about on them and only getting up to feed or play," New Scientist said Wednesday.

The scientists compared the number of injures, which usually occur while scrambling for a feeding position, and the weight gain of the piglets which were provided with plastic plates, foam mats waterbeds, straw or concrete. Piglets on the waterbeds had fewer injuries and gained much more weight than the animals kept on concrete.

According to the magazine, the waterbeds are made from a tough plastic membrane and can be heated from underneath by an electric mat or from above by infrared lamps.

From the passage we know that piglets ______.

A．easily get crushed in the first weeks

B．does not like warm waterbeds in the beginning

C．generally like snuggling up to their mothers for warmth

D．are not happy wallowing in the mud

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第2题

听力原文：Piglets may be happy wallowing in the mud, but they get a much better start in li

听力原文： Piglets may be happy wallowing in the mud, but they get a much better start in life if they are nurtured on a warm waterbed. Instead of snuggling up to their mothers for warmth in their cold pigsty and running the risk of being crushed a common cause of early death-German scientists said waterbeds could be a safer alternative.

According to the magazine, the waterbeds are made from a tough plastic membrane and can be heated from underneath by an electric mat or from above by infrared lamps.

From the passage we know that piglets______.

A．easily get crushed in the first weeks

B．do not like warm waterbeds in the beginning

C．generally like snuggling up to their mothers for warmth

D．are not happy wallowing in the mud

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第3题

听力原文：Ancient man, living in colder climates, is credited with making the first shoes,

听力原文： Ancient man, living in colder climates, is credited with making the first shoes, by adding material to the top of the crude "sandals" his neighbors in warmer climates had invented. He did so out of necessity, to give his feet additional protection from the cold.

Early man, in warmer climates, invented the sandal to protect his feet from sharp rocks, and did so by strapping a mat of woven grass, a strip of animal hide, or a slab of flat wood to his feet with "thongs" he cut out of animal hide. Some even pulled the thongs between the toes and tied them around the ankles to tighten the fit of these crude sandals.

Wealthy ancient Egyptians wore sandals as long as 5,000 years ago, eventually everyone began wearing them, and the Egyptians designed differently. Ancient Greeks invented the boot, by replacing the sandal's thongs with solid leather. Many of these crude shoes have endured and are still worn today. Common examples include the sandals the ancient Greeks and Romans wore, the moccasins American Indians wore, and the clogs people in Holland still wear.

In the Middle Ages, around the time the Crusades began, modem shoes appeared on the scene. The Crusaders, who went on long treks, needed durable, comfortable shoes that people then began making for this purpose.

(23)

A．To give his feet additional protection from the cold.

B．To make the sandals wear-resisting.

C．To match his trousers.

D．To make the sandals look more beautiful.

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第4题

IQ-gene In the angry debate over how much of IQ comes from the genes that children inherit

IQ-gene

In the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those that cause retardation) that affect intelligence. So researchers led by Robert Plomin of London's Institute of Psychiatry decided to look for some. They figured that if you want to find a "smart gene" you should look in smart kids. They therefore examined the DNA of students like those who are so bright that they take college entrance exams four years early — and still score at Princeton—caliber levels. The scientists found what they sought. "We have," says Plomin, "the first specific gene ever associated with general intelligence."

Plomin's colleagues drew blood from two groups of 51 children each, all 6 to 15 years old and living in six counties around Cleveland. In one group, the average IQ is 103. All the children are white. Isolating the blood cells, the researchers then examined each child's chromosome 6 of the 37

landmarks on chromosome 6 that the researchers looked for, one jumped out: a form. of gene called IGF2R occurred in twice as many children in the high-IQ group as in the average group — 32 percent versus 16 percent. The study, in the May issue of the journal Psychological Science, concludes that it is this form. of the IGF2R gene that contributes to intelligence. Some geneticists see major problems with the IQ-gene study. One is the possibility that Plomin's group fell for "chopsticks fallacy". Geneticists might think they've found a gene for chopsticks flexibility. But all they've really found is a gene more common m Asians than, say, Africans. Similarly, Plomin's IQ gene might simply be one that is more common in groups mat emphasize academic achievement." What is the gene that they've found reflects ethnicity？" asks geneticist Andrew Feinberg of Johns Hopkins University. "That alone might explain the link to intelligence, since IQ tests are known for being culturally sensitive and affected by a child's environment." And Neil Risch of Stand ford University points out that if you look for 37 genes on a chromosome, as the researchers did, and find that one is more common in smarter kids, that might reflect pure chance rather than a causal link between the gene and Intelligence. Warns Feinberg, "I would take these findings with a whole box of salt."

In the beginning of paragraph one we are told that scientists can not agree ______.

A．how much of IQ comes from intelligence

B．how many children inherit genes from parents

C．how much of IQ comes from genes

D．how many children learn by experience

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第5题

已知某函数的一个形式参数被说明为MAT[3][10]，在下列说明中，与此等效的形参说明是：

A.int MAT[][10]

B.int MAT[3][]

C.int MAT[10][3]

D.int MAT[][]