设计研究方案的关键是( )
A.选定被试
B.提出假设
C.培训主试
D.实施研究
正确答案是B
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket. Write your word on the ANSWER SHEET.
The Lacepede Islands, a group of four low ( ) islands, lie on a coral reef. (sand)