[单选题]The atmospheric circulation occurs through a process known as _______, which is defined as the circular motion that results when warm air rises and is replaced by cooler air.
A.convection
B.connection
C.connection
D.oncentration

[单项选择]What does the circular halo placed behind the head signify in the art of the Middle Ages


A. Divinity.
B. Sainthood.
C. Cod.
D. Sky.

[单项选择]Iron replaced stone and timber in the building of bridges because iron was considered ______.


A. more beautiful
B. new and modern
C. much stronger
D. easier to transport

[单项选择]The British Empire was replaced by the British Commonwealth or the Commonwealth of Nations in


A. 1921.
B. 1931.
C. 1945.
D. 1950.

[单项选择]It would then be replaced by an interim government, which would（）be replaced by a permanent government after four months.
A. in step
B. in turn
C. in practice
D. in haste

[单项选择]

Information systems design is defined as those tasks that focus on the specification of a detailed computer-based solution. Typically, there are four systems design tasks for in-house development. 1)The first task is to specify (1), which defines the technologies to be used by one, more, or all information systems in terms of their data, processes, interfaces, and network components. This task is accomplished by analyzing the data models and process models that are initially created during requirements analysis. 2)The next systems design task is to develop the (2). The purpose of this task is to prepare technical design specifications for a database that will be adaptable to future requirements and expansion. 3)Once the database prototype has been built, the systems designer can work closely with system users to develop input, output and dialogue specifications. The (3) must be specified to ensure that the outputs are not lost, misrouted, misused, or incomplete. 4)The fourth desi
A. an application architecture
B. adistributed system
C. asystem scope
D. a system physical model

[单项选择]Stone tools began to be replaced around 6,000 years ago by metal tools, who were used to build instruments and simple machines.

[单项选择]Which of the following four drivers can be defined as an illegal driver

[单项选择]The title can be replaced by _____.


A. A Movie Mirrors Bill Clinton and His Wife
B. A Movie Mirrors Presidential Election
C. A Movie Mirrors Fiction
D. A Movie Mirrors Real Life

[单项选择]

Oceanography has been defined as "The application of all sciences to the study of the sea".
Before the nineteenth century, scientists with an interest in the sea were few and far between. Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant(不愿意的) to go to sea to farther his work.
For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question "What is at the bottom of the oceans" had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile(起伏形状) of the route to estimate the length of cable that had to be manufactured.
It was to Maury of the U. S. Navy that the Atlantic Telegra
A. doubled
B. gave proof to
C. challenged
D. agreed to

[单项选择]The "international date line" can be best defined (给......下定义) as


A. the beginning of a new traveling day
B. the border(边界) of two countries
C. the point where a new day begins
D. the place where an agreement can be exchanged(交换)

[单项选择]Where has the process begun


A. Kambia.
B. Port Loko.
C. The east of the country.
D. Both Ａ and Ｂ.