1. The bat of the table tennis is also called the ping-pong paddle or racquet.

听力原文：W: let's go playing ping -pong ball.

M : I can't go right now. I have an appointment with my doctor.

Why can't the woman go playing ping -pong ball right now?

A．She must do something else at first.

B．She doesn't like playing ping -pong at all.

C．She cannot afford the time.

D．She has an important appointment with her doctor.

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.

Based on the passage, causality may have the meaning that ______.

A．cause and effect can be independent of each other

B．there is hardly anything that happens without a cause

C．dependent and independent variables affect each other

D．cause and effect may vary respectively in most events

Section A

Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices A , B, C, and D.

听力原文：M: I can't find my ping-pong bats in the drawer and my friends are waiting for me downstairs.

W: Look in the closet. This morning I cleaned up the drawer and I put everything down there.

Q: Where will the man find his pingpong bats?

(1)

A．At the downstairs.

B．In the closet.

C．In the drawer.

D．In the living room.

The example of the ping-pong' ball is used to ______.

A．predict variations in a person's performance

B．indicate a hard nut to crack in physics

C．prove a common feature most theories have

D．show the negligibility of intervening variables