题目内容

What does the man possibly do

A. Maybe a teacher.
B. Maybe a student.
C. Maybe a meeting organizer.

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In September, in Britain, you may see a lot of birds (36) on roofs and telegraph wires. These birds are swallows. They are (37) together because, very soon, they will be flying (38) to much warmer lands, where they will find (39) small flying insects on which they (40) . There are no such insects (41) in Britain during the winter, as it is (42) cold for them. The swallows settle, fly off, swoop, and (43) again. This they do many times, for they are making short (44) flights in order to be fit for the long journey (45) them. (46) of these migrating birds leave Britain in the autumn. They fly (47) for hundreds of miles (48) they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with (49) . In the spring of the following year they (50) the long and tiring journey back to Britain. They return to the identical barn or tree in the (51) district which they had left the (52) autumn. How do these birds find their (53) there and back over such vast distances Nobody knows exactly (54) , but it has something to do (55) winds and air currents.

A. before
B. previous
C. ago
D. former

After finishing the task, the little boy stood there _________________ (好像在等别人对他说“谢谢”).

案例分析题假设某程序语言的文法如下:S→a|b|(T)T→TdS|S其中,VT=a,b,d,(,));VN=S,T,S是开始符号。考察该文法,句型(Sd(T)db)是S的一个()。其中()是最左素短语,()是该句型的直接短语。 其中()是最左素短语。

A. S
B. b
C. (T)
D. Sd(T)

Becoming aware of our mother’s age includes not only her natural age but also her psychological and physical state.

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