更多"A new mother is concerned because h"的相关试题:
[单项选择]A) Because she leaves her mother. C) Because she is iii.
B) Because she is in the hospital. D) Because her mother is iii.
[填空题]Emma told her mother that her father got heart attack and collapsed in his doing the new project.
[填空题]The mother fixed her eyes on her son with deep feelings, ______ (希望他能读懂她对他的爱).
[填空题]
What does the speaker think of her mother?
Her mother is the () person to her.
[多项选择]As far as hobbies are concerned, Jane and her sister ______________________ (几乎没有什么共同之处).
[单项选择]What does the mother ask her son to do
A. Be careful on the way.
B. To greet his uncle.
C. Come back early.
[单项选择]Passage 3
If a mother pushes her small son in a swing, giving only a light force each time he returns, eventually he will be swinging quite high. The child can do this for himself by using his legs to increase the motion, but both the mother’s push and the child’s leg movements must occur at the proper moment, or the extent of the swing will not increase. In physics, increasing the swing is increasing the amplitude; the length of the rope on the swing determines its natural oscillation period. This ability of an object to move periodically or to vibrate when stimulated by a force operating in its natural period is called resonance.
Resonance is observed many times without consciously thinking about it; for example, one may find an annoying vibration or shimmy in an automobile, caused by a loose engine mount vibrating with increasing amplitude because of an out-of-round tire. The bulge on the tire slaps the pavement with each revolution; at the natural resonance point of t
A. vibrate
B. resonate
C. swing
D. oscillate