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【单选题】
餐厅服务员在斟酒服务中，持瓶时，右手大臂与小臂应呈的角度为（）A.
80°
B.
85°
C.
90°
D.
95°
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【简答题】According to Kid fluence, 'persistence nagging' is less effective than the more sophisticated 'importance nagging'.
【单选题】According to the passage, unresponsive care from a mother may ______.
A.
ruin a kid's growth
B.
harm the mother-child tie
C.
injure a baby's emotional reaction
D.
spoil a child's personality
【多选题】Check the true statements.
A.
It’s a description of the first few days at college.
B.
It’s a personal and private story.
C.
The writer uses past tenses.
D.
It’s factual.
E.
It’s written in the third person.
【单选题】According to the passage, unresponsive care from a mother may ______.
A.
rain a kid's growth
B.
harm the mother-child tie
C.
injure a baby's emotional reaction
D.
spoil a child's personality
【简答题】探究：音调是怎样变化的． 提出问题：要改变音调，就必须改变振动频率． 猜测和假设：振动频率与物体紧密、长度、厚度有关． 探究器材：粗、细、长短不同的弦若干根、一张共鸣板． 设计实验： 实验一：物体越绷紧，振动越快，它的音调越高，反之音调越低． 器材：弦A和弦B的粗细、长度相同，弦A比弦B绷得紧． 做法：拨动这两根弦，如图所示． 实验二：物体越短，振动越 ______，它的音调越 ______，反之...
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