The babies would "smile and bubble" at the lights because___．

A . About 18 months. B . About 21 months. C . About 24 months. D . About 12 months,

A . little B . a little C . few D . a few

A．A.but B．B.neither C．C.let alone D．D.not alone

A．a; a B．/; a C．the; the D．the; /

A．the lights were directly related to some basic "drives" B．the sight of the lights was interesting C．they need not turn back to watch the lights D．they succeeded in "switching on" the lights

A.perceptions B.consultations C.interactions D.interruptions

A.open B.opening C.to open D. opened

A.so as to B.so as not to C.so as to not D.as so to

A.It is dangerous for the female. B.It happens once a year. C.It is hard work for the male. D.It occurs in the deep sea.

A．is important because words have different meanings for different people B．is not especially important because the changeover takes place gradually C．is one that can never be properly understood because the meaning of words changes with age D．is one that should be completely ignored because children's use of words is often meaningless

A: few B; little C; a little

A．Just after midnoon on Saturday. B．Just after midnight on Saturday. C．Just before midnoon on Sunday. D．Just before midnight on Sunday.

A. throughout their lives B. for more than two decades C. from birth to 21 months D. until they get married

If possible, use a drug with which you are familiar. If you use a new drug, be especially on the watch for adverse reactions. Report serious or unusual reactions suspected as due to established drugs, and any reaction however slight that may be due to a newly marketed drug. This is a set of recommendations for ______. A．doctors prescribing for patients B．doctors training people who take drugs C．drug companies D．persons who sell drugs

It is now clear that this is not so. Babies will learn to behave in ways that produce re suits in the world with no reward except the successful outcome. Papousek began his studies by using milk in normal way to "reward' the babies and so teach them to carry out some simple movements, such as turning the head to one side or the other. Then he noticed that a baby who had enough to drink would refuse the milk but would still go on making the learned response with clear signs of pleasure. So he began to study the children's responses in situations where no milk was provided. He quickly found that children as young as four months would learn to turn their heads to right or left if the movement "switched on' a display of lights and indeed that they were capable of learning quite complex turns to bring about this result, for instance, two left or two right, or even to make as many as three turns to one side. Papousek's light display was placed directly in front of the babies and he made the interesting observation that sometimes they would not turn back to watch the lights closely al though they would "smile and bubble when the display came on. Papousek concluded that it was not primarily the sight of the lights which pleased them, it was the success they were achieving in solving the problem, in mastering the skill, and that there exists a fundamental human urge to make sense of the world and bring it under intentional control. According to the author, babies learn to do things which ______. A．will satisfy their curiosity B．will meet their physical needs C．are directly related to pleasure D．will bring them a feeling of success

A．to B．for C．away D．at