根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项为多余选项。
Every scientific field uses the scientific method to conduct experiments. Performing experiments is very important in the field of psychology （心理学）. Before beginning a study, however, any scientist who wishes to perform an experiment should be familiar with the steps of the scientific method.   
◆ Form a hypothesis （假设）. It is an educated guess about what will happen during the study.       Coming up with a hypothesis before you start can help guide your experiment.
◆ Plan out a study. Planning out the experiment is essential because the psychologist needs to know if they have time, materials, and testing area prepared beforehand. This step also helps the scientist to determine if they will be performing descriptive or experimental research. The ideal situation is to always perform experimental research.       Descriptive research simply collects data regarding the problem and forms a hypothesis according to the data.
◆ Collect data.      If the data collected is not recorded and organized, the entire efforts of the study may be wasted. The best way to do this may be to record the proceedings so that no details are lost.
◆ Analyze the data.  Once all the data has been collected and organized, it must be analyzed. Using previous research or scientific information about the problem, the psychologist must apply the new data gathered.
◆ Publish the information learned. The final step of the scientific method in psychology is publishing the results of the study.    Most psychological experiments are published in scientific journals.

A．It is based on scientific facts, not just opinions.

B．Read on to find out how to use the scientific method in psychology.

C．Before psychologists start the experiment, they must plan out the steps.

D．This helps other psychologists to learn about and use the new information.

E. The scientific method has proved to be an effective way to conduct research.
F. To fully understand the study, each part of the experiment must be recorded.
G. Sometimes, however, this is impossible and descriptive research will have to be used.