搜题请搜索小程序“爱下问搜题”
问题 单项选择题

癌与肉瘤的主要区别是

A．转移途径不同

B．恶性程度不同

C．患者的年龄不同

D．肿瘤的色泽不同

E．肿瘤的起源不同

答案

参考答案：E

解析：癌与肉瘤的主要区别是肿瘤的起源不同，起源于上皮的恶性肿瘤，称为癌；起源于间叶组织的恶性肿瘤，称为肉瘤。

选择题

据报载，几乎每年都有至少一种鸟类或哺乳动物从地球上消失，造成它们濒危或灭绝的主要原因是（    ）。

A．自然灾害

B．天敌过多

C．动物病害

D．人类活动对生态环境的破坏
查看答案
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。

10（）

A.deposits

B.dreams

C.flashes

D.files
查看答案