磷酸戊糖途径的主要生理意义在于( )A．提供能量B．将NADP+还原成NADPHC

书面表达。

     请你根据下面的中文提示写一篇短文。    

     我来自南京阳光中学。每星期六上午，我和妈妈都乘公共汽车去超市。我们通常在超市里待两个小时。爸爸很少 （seldom） 和我们一起去，因为他很忙。周末的时光总是很快乐。

       要求：1. 运用第一人称；

                   2. 要点明确、条理清晰；

                   3. 60词左右。 

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反映肺泡毛细血管膜弥散能力的有效指标是 （）

A.血氧饱和度

B.动脉血氧分压

C.氧含量

D.氧合指数

E.肺泡-动脉血氧分压差

If the eyes are the romantic’s window into the soul, then the teeth are an anthropologist’s ( 人类学家 ) door to the stomach.

In a study published last month in the journal Science, Peter Ungar of the University of Arkansas and his partner, Matt Sponheimer of the University of Colorado, US, examined the teeth of our early human ancestors to find out what they were really eating.

They already knew that different foods cause different marks on teeth. Some cause scratches, while others cause pits (坑).The carbon left on teeth by different foods is also different. Tropical grasses, for example, leave one kind of carbon, but trees leave another kind because they photosynthesized ( 光合作用 ) differently.

Traditionally, scientists had looked at the size and shape of teeth and skulls ( 头骨 ) to figure out what early humans ate. Big flat teeth were taken to be signs that they ate nuts and seeds, while hard and sharp teeth seemed good for cutting meat and leaves. But this was proven wrong.

The best example was the Paranthropus (傍人), one of our close cousins, some of which lived in eastern Africa. Scientists used to believe Paranthropus ate nuts and seeds because they had big crests(突起)on their skulls, suggesting they had large chewing muscles and big teeth. If this had been true, their teeth should have been covered with pits like the surface of the moon. They would also have had a particular type of carbon on their teeth that typically comes from tree products, such as nuts and seeds.

However, when the two scientists studied the Paranthroupus, it turned out to have none of these characteristics. The teeth had a different kind of carbon, and were covered with scratches, not pits. This suggests they probably ate grass, not nuts and fruit stones. It was the exact opposite of what people had expected to find.

Carbon “foodprints” give us a completely new and different insight into what different species ate and the different environments they lived in. If a certain species had the kind of carbon on its teeth that came from grasses, it probably lived in a tropical grassland, for example.

小题1:The underlined sentence in Paragraph 1 probably means that _____.

A．anthropologists can study the structure of human stomachs by studying their teeth.

B．anthropologists can study the diet of early humans by studying their teeth

C．anthropologists can learn whether humans were healthy by looking at their teeth

D．anthropologists can get the most useful information about humans from their teeth小题2:According to Paragraph 3 to 5, which of the following statements is TRUE?

A．Scratches on teeth are caused by eating nuts or seeds.

B．Pits on teeth are caused by eating grass or leaves.

C．Early humans with hard and sharp teeth ate meat and leaves.

D．Different foods leave different marks and carbon on teeth.小题3:The example of the Paranthropus was mentioned in the article in order to _____.

A．tell readers that they are one of our close cousins living in eastern Africa

B．tell readers they had different eating habits from modern humans

C．prove that size and shape of skulls does not show accurately what early humans ate

D．tell readers that living environment makes a difference to skull structure

近年来我国在冀东渤海湾发现储量达10亿吨的大型油田，关于石油的说法正确的是

A．石油属于可再生矿物能源

B．石油主要含有碳、氢两种元素

C．石油的裂化属于物理变化

D．裂化汽油不能使溴水褪色

磺酰脲降糖药物若要产生作用，则至少要求胰岛中正常的β细胞不少于（）

A.10%

B.20%

C.30%

D.40%

E.50%