目前门控心肌显像采集时，通常将一个心动周期分成多少等份。（） A.1～5 B.5～7

Part 3

Questions 19-25

·Read the following passage and answer questions 19-25.
·For questions 19-25, choose the correct answer from A, B, C and D.
·Mark your answer on the Answer Sheet.
The number of speakers of English in Shakespeare’s time is estimated to have been about five million. Today it is estimated that some 260 million people speak it as a native language. Mainly in the United States, Canada, Great Brittany, Ireland, South African, Australia and New Zealand. In addition to the varieties of English found in these areas, there are great many regional and social varieties of the language, as well as various levels of usage that are employed both in its spoken and written forms.
It is virtually possible to estimate the number of people in the world who acquired adequate work knowledge of English in addition to their own languages. The purpose for which English is learned and the situation in which such learning takes place are so varied that it is difficult to define and still more difficult to assess what constitutes an adequate working knowledge for each situation.
The main reason for the widespread demand for English is its present-day importance as a world language. Besides serving the infinite needs of its native speakers, English is a language in which some of the most important works in science, technology, and other fields are produced and not always by native speakers. It is widely used for such purpose as meteorological and airport communications, international conferences, and the spread information over the radio and television networks of many nations for the number of developing countries, especially former British colonies. Many of these countries have multi-lingual populations and need a language for internal communication as well as for international communication and for access to the scientific and technological development in the west.

______ constitutes an adequate working knowledge of English.

A．The ability to read the newspaper

B．Being multi-lingual

C．Being a native speaker

D．It is difficult to assess what

在平面内，若直线a垂直于c，直线b垂直于c，则直线a平行于直线b；在空间，若直线a垂直于c，直线b垂直于c，则直线a与直线b不一定平行。从哲学上看，这说明

A．任何真理都有自己适用的条件和范围

B．真理和谬误是一对矛盾

C．真理有时不是客观的

D．人们的认识能力不同，水平认识就不同

辨痒，皮肤瘾疹，焮红灼热作痒，属（）。

A.湿痒

B.风痒

C.虫淫痒

D.血虚痒

E.热痒

平行光线入射散光眼后，两条焦线都聚焦在视网膜前，或都聚焦在视网膜后，称为（）。

A、单纯性散光

B、复性散光

C、混合性散光

D、不规则性散光

期末结转后无余额的账户有[ ]

A．实收资本

B．主营业务成本

C．库存商品

D．销售费用