题目:
旅客列车发生旅客人身伤害应急处置预案规定的应急处理原则是:赶赴现场、()、调查取证、(),事故通报。
答案:
参考答案:组织抢救;移交处理
旅客列车发生旅客人身伤害应急处置预案规定的应急处理原则是:赶赴现场、()、调查取证、(),事故通报。
参考答案:组织抢救;移交处理
如今死海水平面从原来的–392米下降到–412米,水面面积由950平方千米锐减到630平方千米,除了两岸过度开采地下水和围死海开采钾盐等原因外,造成这一恶果的原因主要是
A.死海的源头大部分水流被人为改道,致使死海的蒸发量大于补充量,导致严重的入不敷出
B.地层下陷速度加快
C.气候变暖,降水日益减少
D.大面积围湖造田
舞曲中的“圆舞曲”也叫()
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
登记制
胰腺癌与总胆管结石的主要鉴别点是
A.进行性黄疸
B.肝功能改变
C.淀粉酶改变
D.胆囊肿大
E.皮肤搔痒