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问题 单项选择题

互联网思维变革制造业。小米手机根据用户需求，研制出了专门为老年人设计的老人功能机，小米手机因此也获得了丰厚的经济效益。这表明（）

①广告营销是公司提高经济效益的手段

②消费对生产有重要的反作用

③收入是消费的基础和前提

④创新推动社会生产力的发展

A、①②

B、①④

C、②③

D、②④

答案

参考答案：D

解析：本题考查消费对生产的反作用、创新的社会作用。“小米手机根据用户需求，研制出了专门为老年人设计的老人功能机，小米手机因此也获得了丰厚的经济效益”表明消费对生产有重要的反作用，②符合题意入选；“互联网思维变革制造业”表明了创新推动社会生产力的发展，④符合题意入选；上述材料没有体现“广告营销”，也没有体现“收入与消费的关系”，①③不符合题意排除。本题答案选D。

判断题

如果两个随机变量的协方差为零，则这两个随机变量是独立的。
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单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus; the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) . It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long-term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) --Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Ocean Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

Notes: childhood amnesia 儿童失忆症。

（3）（）

A.largely

B.rarely

C.merely

D.really
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