[单项选择]I had just posted the letter when I remembered that I hadn't ______ the cheque.
A. imposed
B. contained
C. enclosed
D. involved

[单项选择]When he discovered who had written the letter to his mother, the soldier______.


A. was filled with great surprise
B. recognized Lincoln at once
C. asked Lincoln who he was
D. asked Lincoln to hold his hand

[单项选择]According to the passage, when had historical archaeologists been trained as anthropologists


A. Before the 1930s.
B. During the 1930s and 1940s.
C. During the 1950s and 1960s.
D. After the 1960s.

[单项选择]What he said just now had little to do with the question _________ discussion.


A. with
B. under
C. by
D. over

[单项选择]Bob hadn't seen Jim for a year when he learned that Jim was in another town.

[单项选择]Mr. Ralph has just received an invitation from that university to join ______ as a full professor.


A. association
B. committee
C. community
D. faculty

[单项选择]Generally, it is only when animals are trapped that they______ to violence in order to escape.


A. proceed
B. appeal
C. resort
D. incline

[单项选择]

For some time past it had been widely accepted that babies—and other creatures—learn to do things because certain acts lead to "rewards"; and there was no reason to doubt that this is true. But it used also to be widely believed that effective rewards, at least in the early stages, had to be directly related to such basic physiological(生理的) "drives" as thirst or hunger. In other words, a baby would learn if he got food or drink or some sort of physical comfort, not otherwise.
It is now clear that this is not so. Babies will learn to behave in ways that produce results in the world with no reward except the successful outcome.
Papousek began his studies by using milk in the 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 had enough to drink would refuse- the milk but would still go on making the lea
A. are directly related to pleasure
B. will meet their physical needs
C. will bring them a feeling of success
D. will satisfy their curiosity