搜题请搜索小程序“爱下问搜题”
问题 单项选择题

当将雷氏夹的一根指针的根部先悬挂在一根金属丝上，另一根指针的根部挂上300g砝码时，两根指针针尖的距离增加应在（）

A.17.5mm±2.5mm

B.10.0mm±1.0mm

C.20.0mm±3.0mm

D.22.5mm±2.5mm

答案

参考答案：A

填空题

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.

An appropriate title for this passage would be ______.

A．English as a World Language

B．International Communications

C．The Difficulty of Learning English

D．The Standard Variety of English
查看答案
填空题

吐鲁番盆地是我国夏季气温最（）的地区，主要是由于（）。
查看答案