皮皮学，免费搜题
登录
搜题
【单选题】
关于反射,下列哪项是错误的A.
是机体在神经中枢参与下发生的反应
B.
可分为条件反射和非条件反射
C.
机体通过反射,对外界环境变化作出适应性反应
D.
没有大脑,就不能发生反射
E.
其结构基础是反射弧
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements is true about Medieval British Literature?
A.
The most prevailing kind of literature was the romantic verse and prose.
B.
The heroes of Romance are peasants.
C.
Chivalry is advocated among common people.
D.
Alliterative poems were dominant in medieval British literature.
【单选题】It's not difficult to understand our desire for athletes to be heroes. On the surface, at least, athletes display a vital and indomitable spirit they are gloriously alive【B1】their bodies. And sports d...
A.
outside
B.
inside
C.
besides
D.
with
【简答题】用所给词的适当形式填空。 I. She thinks schoolwork is ______ (important) than ______ (play). 2. Look! The bird ______ (make) a nest (巢) ______ the tree. 3. The winter vacation is ______ (come). Let's _____...
【简答题】When we talk about a wolf, we tend to describe it as a kind fierce creature．But is it really true that the wolf stands for devil and ugliness? Have you read the book 'The Wolf Totem'' 《狼图腾》by a famous...
【单选题】Which kind of heroes do Daniel and Dory belong to?
A.
first responders
B.
civilians
C.
soldiers
D.
historical figures
【单选题】在神经管畸形高发地区,妇女在计划怀孕时,要在怀孕前3个月到怀孕后3个月补充小剂量( ),可以减少神经管畸形的发生风险。
A.
碘剂
B.
叶酸
C.
各种维生素
D.
钙片
【简答题】When we talk about a wolf, we tend to describe it as a kind of fierce creature. But is it true that the wolf stands for devil(魔鬼) and ugliness? Have you read the book 'The Wolf Totem'' 《狼图腾》by a famou...
【多选题】第一位给近代地理学比较明确定义的学者是德国地质地理学家李希霍芬，下列哪些观点是他提出的？
A.
地理学必须限于研究地球表层，即岩石圈、水圈、大气圈和生物圈相互接触的地方。
B.
地理学的特殊目的是集中研究地球表面上相互联系的各种现象。
C.
为了要取得有益的可靠的结论，地球表面上任何部分的地理研究都必需以详细描述自然现象开始，然后推进到地球表面的其他现象与基本的自然结构的关系。
D.
地理学的最高目标在于发掘人类和物质的地球以及与自然现象也有联系的生物现象之间的关系。
相关题目：