单选题：According to the context，what does the word“positives”in the

题目内容：

According to the context，what does the word“positives”in the fifth paragraph mean? A．positive electric charges
B．evidences
C．warnings
D．predictions

参考答案：

答案解析：

The Tiniest Electric．Motor in the World　　1．Scientists recent

The Tiniest Electric．Motor in the World　　1．Scientists recently made public the t

分类：理工类题型：单选题

It can be inferred from what Denis Park says that mental ability is determined e

分类：理工类题型：单选题

You startled(A级)me when you shouted． A．threatened B．amazed C．interrupted D．troub

分类：理工类题型：单选题

By analyzing the results of tae kwon do at the summer games，the anthropologists

分类：理工类题型：单选题

Single—parent Families 　　Today we tell about the major change in the American fa

分类：理工类题型：单选题