通常情况下，碱性石料的粘附性比酸性石料好。( )

社区工作者在进入居民对社区事务漠不关心这类社区时，一般都会以培养居民的 ( )为目标。

A．自主

B．自立

C．发展互助

D．建立社区团结

E．相互鼓励、认同

某套二手住房买卖，买方付给卖方1500元/平方米，该价格含应由买方缴纳的3%契税。该套住房的正常成交价格为（）元/平方米。

A.1455.00

B.1456.31

C.1545.00

D.1546.39

What have been the big events that have__________China over the last year 2009?

A．shaped

B．taken

C．stated

D．made

Which of the following, if true, best completes the passage below
The traditional view of Homer is that of a blind bard who wrote down the epic poems known as the Iliad and the Odyssey in the eighth century B.C.E. We know now, however, that this picture cannot be true. The language used in the epic poems contains elements of the Greek language dating from the twelfth to the eighth centuries B.C.E., but the Greek writing system was not developed until the late seventh century, when it was used to record clerical notes. A more accurate statement regarding Homer, therefore, is that, if he existed, he most likely ？（）

A. wrote the poems down in the fifth century B.C.E., using a pre-existing oral tradition of Greek epic poetry.

B. was involved in the recording of clerical notes in Greek in the seventh century.

C. composed the poems orally in the eighth century and then dictated them to a scribe in the late seventh century.

D. composed the poems orally in the twelfth century, using a predecessor of the Greek language.

E. composed the poems orally in the eighth century, using elements of pre-existing Greek epic poetry.

雪崩光电二极管（APD）具有（）

A.内部放大作用

B.内部衰减作用

C.内部平衡作用

D.内部纠错作用