单选题：Paragraph 6______.

题目内容：

Paragraph 6______. A．Ongoing Research
B．Extension of Use
C．Robot Heroes
D．Greater Reliability
E．Falling Demand
F．Hidden Danger

参考答案：

答案解析：

They finally modify their research plan.

They finally modify their research plan.A．clarify B．change C．define D．develop

分类：理工类题型：单选题

根据材料，完成题The First BicycleThe history of the bicycle goes back more than 200 year

分类：理工类题型：单选题

请在第_(49)___处填上正确答案A．Another distinction between science and technology has to do

分类：理工类题型：单选题

According to the passage, the abilities a child has inherited from his parents _

分类：理工类题型：单选题

请在第__(50)__处填上正确答案。A．The American version of Mother's Day was thought up as earl

分类：理工类题型：单选题