平衡反射的出现年龄是（） A.12个月 B.15个月 C.18个月 D.20个月 E_爱下问搜题

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问题单项选择题

平衡反射的出现年龄是（）

A.12个月

B.15个月

C.18个月

D.20个月

E.24个月

答案

参考答案：E

解析：平衡反射是当身体重心移动时或支持面倾斜时，机体为保持平衡，调节肌张力，支配四肢的代偿动作，保持正常姿势的反应，包括：倾斜反射，爬位、坐位、立位的平衡反射。立位前方、侧方、后方平衡反射的出现时间分别为生后12个月、18个月、24个月，所以选项为E。

完形填空

For years scientists have been arguing about whether nature or nurture (后天) decides what people will be like. Is it nature— what people are (41) with— that decides what they will be like? (42) is it nurture —what(43) to people when they are born —that decides what they will be like?
Scientists have been studying twins to (44) if they can find the answer, because twins start out with the (45) DNA. Sometimes twins don’t live together at birth and grow up in different (46) and different places— so the nature is the same for both, but the nurture is different.
When scientists (47) these twins in their later life, they some times find some surprising (48).
Jim Springer and Jim Lewis were adopted（收养）by two different families at birth. They first met each other again thirty-nine years (49) and discovered they had a lot in (50). Both had been (51) twice. Their first wives were both named Linda and their second wives were both named Betty!
Each twin had a son — one called his son James Alan and the (52) called his son James Alan, too. Their children each had a dog called “Toy”. They even arrived at their first (53) in the same color of car.
So far twin (54) seem to show that both nature and nurture are important. What we have from birth, and how and where we live help to build (55) we are.

B．discoveries

D．interviewed

A．competition

单项选择题

对方未要求答复，而收文机关主动告知办理情况和结果是（）。

A.针对性复文

B.上复性复文

C.询索性复文

D.知照性复文