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  3. Science is an enterprise concerned with gaining information about causality, or the relationship between cause and effect. A sim

Science is an enterprise concerned with gaining information about causality, or the relationship between cause and effect. A sim

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问题    Science is an enterprise concerned with gaining information about causality, or the relationship between cause and effect. A simple example of a cause is the movement of a paddle as it strikes a ping-pong ball; the effect is the movement of the ball through the air. In psychology and other sciences, the word "cause" is often replaced by the term "independent variable". This term implies that the experimenter is often "free" to vary the independent variable as he or she desires (for example, the experimenter can control the speed of the paddle as it strikes the ball). The term "dependent variable" replaces the word "effect", and this term is used because the effect depends on some characteristic of the independent variable (the flight of the ball depends on the speed of the paddle). The conventions of science demand that both the independent and dependent variables be observable events, as is the case in the ping-pong example. In the case of biorhythm theory, the independent variable is the number of days that have elapsed between a person’s date of birth and some test day. The dependent variable is the person’s level of performance on some specified task on the test day. Notice that although the experimenter is not free to choose a birthday for a given individual, persons with different dates of birth can be tested on the same day, or a single subject can be tested on several different days.
   In order to predict the relationship between independent and dependent variables, many scientific theories make use of what are called intervening variables. Intervening variables are purely theoretical concepts that cannot be observed directly. To predict the flight of a ping-pong ball, Newtonian physics relies on a number of intervening variables, including force, mass, air resistance, and gravity. You can probably anticipate that the intervening variables of biorhythm theory are the three bodily cycles with their specified time periods. It should be emphasized that not all psychological theories include intervening variables, and some psychologists object to their use precisely because they are not directly observable.
   The final major component of a scientific theory is its syntax, or the rules and definitions that state how the independent and dependent variables are to be measured, and that specify the relationships among independent variables, intervening variables, and dependent variables. It is the syntax of biorhythm theory that describes how to use a person’s birthday to calculate the current status of the three cycles. The syntax also relates the cycles to the dependent variable, performance, by stating that positive cycles should cause high levels of performance whereas low or critical cycles should cause low performance levels. To summarize, the components of a scientific theory can be divided into four major categories: independent variables, dependent variables, intervening variables, and syntax.
The word "syntax" (Paragraph 3) refers to the ______.
选项 A、rules used for ordering and connecting words in a sentence
B、principles defining the connections among different variables
C、definitions describing the impact of biorhythm on one’s behavior
D、criteria measuring a person’s performance levels with biorhythm
答案B
解析 这是一道词义题。题干中的信号词出自于文章第三段第一句话中。文章第三段指出：科学理论的最后一个重要组成部分就是措辞法，或者是说明如何测量自变量和因变量的规则和定义，是解释自变量、介入变量以及因变量之间关系的规则和定义。这说明，B“定义不同变量之间联系的原理”与文章的意思符合。A是该词的普通意思，与文章的意思不符合；C与该段第二句话“正是生物节律理论的措辞法描述了如何使用一个人的出生日期来估算三种循环的现状”的意思不符；D与该段第三句话的意思不符合。
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