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【单选题】
截至2018年6月，中国人工智能企业数量位列全球（ ）A.
第一
B.
第二
C.
第三
D.
第四
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】舞蹈作品的内容包含( )与( )两种因素
【简答题】A．Cries of birds are affected by seasons. B．Only some sorts of birds can cry. C．Birds would cry when they meet ers. D．It is easy to tell the singing of a bird from its crying.
【多选题】关于预制涵洞拱圈的安装施工，正确的有（ ）。
A.
预制拱圈安装后，成品拱圈吊装孔，应以粘土填塞
B.
预制拱圈成品混凝土强度达到设计强度的70％时，方可搬运安装
C.
预制拱圈块之间的砌筑应采用干砌
D.
预制拱圈成品安装前，应检查成品及拱座、墩、台的尺寸
E.
拱座与拱圈拼装接触面，应先拉毛或凿毛(沉降缝处除外)，安装前应浇水湿润，再以M10水泥砂浆砌筑
【单选题】Birds singing is sometimes a warning to other birds away.
A.
Stay
B.
staying
C.
stayed
D.
to stay
【简答题】阅读理解。 Birds Journeys The wish that shows birds to begin their journeys, and the highly exact feeling of direction shown by traveling birds, stay among the most puzzling mysteries of science. The Arcti...
【简答题】阅读理解。 It was getting late. There was no noise in the forest. We could only hear the birds singing. And then, a bear-a big brown bear-came into the forest. The bear stopped under a tall tree. He was ve...
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