中国古代第一部通史是（）A、《春秋》 B、《史记》 C、《汉书》 D、《资治通鉴》

最常见的x性连锁隐性遗传的进行性肌营养不良的类型是()

A．面肩肱型肌营养不良

B．Duchenne肌营养不良

C．Becker肌营养不良

D．肢带型肌营养不良

E．眼肌型肌营养不良

Reading comprehension.

     A recent study of ancient and modern elephant has come up with the unexpected conclusion that the

African elephant is divided into two distinct (不同的) species.

     The discovery was made by researchers at York and Harvard University when they were examing the

genetic relationship between the ancient woolly mammoth and mastodon modern elephants-the Asian

elepphant, African forest elephant, and African savanna elephant.

     Once they obastain DNA sequences (序列) from two fossils (化石), mammoths and mastodons, the

team comparted them with DNA from modern elephants. They found their amazement that mordern forest

and savanna elephants are as distinct from each other as Asian elephants and mammoths.

     The scientists used detailed genetic analysis to prove that the African savanna elephant and the African

forest elephant have been distinct species for several million years. The divergence of the two species took

place around the time of the divergence of Asian elephants and woolly mammoths. This result amazed all

the scientists.

     There has long been debate in the scientific community that the two might be separate species, but this

is the most convincing scientific evidence so far that they are indeed different species.

     Previously, many naturalists believed that African savanna elephants and African forest elephants were

two populationgs of the same species, despite the elephants' significant size differences. The savanna elephant

has an average shoulder height of 3.5 metres while the forest elephant has an averate shoulder double the

weight of the forest elephant. But the fact that they look so differrent does not neccssarily mean they are

different species. However, the proof lay in the analysis of the DNA.

     Alfried Roca, assitant professor in the Department of Animal Sciences at t he University of Illinois, said,

"We now have to treat the forest and savanna elephants as two difficult units for conservation purpose.

Since 1950, all Afican elephants have been conserved as one species. Now that we know the forest and

savanna elephants have been distinct animals, the forest elephant should become a bigger priority (优先) for

conservation purposes."

1. One of the fossiles studied by the researchers is that of _____.

A. the Asian elephant

B. the forest elephant

C. the savanna elephant

D. the maslodon elephant

2. The underlined word "divergence" in Paragraph 4 means "_____".

A. evolution

B. exhibition

C. separation

D. examination

3. The researchers' conclusion was based on a study of the African elephant's _____.

A. DNA

B. height

C. weight

D. population

4. What are Alfred Roca's words mainly about?

A. The conservation of Afican elephant

B. The purpose of studying Afican elephant

C. The way to divide Afican elephants into two units

D. The renson for the distinction of African elephants

5. Which of the following can be the best tille for the passage?

A. Naturalist' Beliefs about Elephants

B. Amazing Experiments about Elephants

C. An Unexpected Finding ahout Elephants

D. A Long Scientifif Debate about Elephants

男性，10岁，上腹部被车撞伤1天，感右上腹及背部疼痛，呕吐咖啡样液体。X线检查：膈下未见游离气体，腹膜后少量积气，最可能的诊断为()

A．胃穿孔

B．肠系膜损伤

C．横结肠穿孔

D．肝破裂或胆道损伤

E．十二指肠损伤

根据《行政处罚法》和《治安管理处罚法》，下列有关罚款决定的说法正确的有：

A．治安管理处罚中，罚款决定的执行也实行《行政处罚法》中规定的罚款决定与罚款收缴相分离的原则

B．治安管理处罚中，人民警察可以当场收缴罚款的情形之一即是罚款20元以下且被处罚人对罚款无异议的

C．治安管理处罚中，如果被处罚人在当地没有固定处所且不当场收缴事后难以执行的，人民警察可以当场收缴罚款，即使罚款超过50元也可以当场收缴

D．治安管理处罚中，人民警察在旅客列车上当场收缴的罚款，应当自到站之日起2日内，交至所属的公安机关

光学厚度