试题题干
Translate the following sentence into Chinese.
A placebo is a harmless substance given to one group of patients in the trial and it is similar in taste and appearance to a new drug which is given to a second group of patients.
参考答案
试题解析
考点：placebo 安慰剂；harmless substance 无害物质；in the trial 在试验中。
句子结构：句子为一个并列句。前半句主干为A placebo is a harmless substance，后半句主干为it is similar in taste and appearance to a new drug，which引导定语从句修饰a new drug。