皮皮学，免费搜题
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【单选题】
下面哪个不是Android系统的特点（ ）。A.
开源，得到众多厂商支持
B.
无缝结合 Google 应用
C.
应用程序发展迅速
D.
Android 系统中默认浏览器是 safari
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Egg prices usually ________ in spring when they are most plentiful.
A.
are dropping
B.
drop
C.
have dropped
D.
will drop
【判断题】The perfume medicine bags for children during Dragon Boat Festival are usually filled with magwort and calamus.
A.
正确
B.
错误
【单选题】Prices usually reflect
A.
only the value of a good to society.
B.
only the cost to society of making a good.
C.
both the value of a good to society and the cost to society of making the good.
D.
neither the value of a good to society nor the cost to society of making the good.
【单选题】House prices vary from place to place and are usually high ________ there are famous schools.
A.
when
B.
since
C.
where
D.
whether
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