单项选择题
When a psychologist does a general experiment about the...
单项选择题When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.
______ a sudden explosion, there is a real probability ...
单项选择题______ a sudden explosion, there is a real probability that these kids could be injured.
Smith did the only ______ thing by asking the Indians f...
单项选择题Smith did the only ______ thing by asking the Indians for food and shelter in their village.