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【单选题】
下列命题为真命题的是（ ）A.
函数y=sin 2 x-cos 2 x是奇函数
B.
已知命题p：对任意实数x， 1 x 2 -1 ＜0，则非p可表示为：至少存在一个实数x 0 ，使x 0 ≤-1，或x 0 ≥1
C.
“ ∫ t1 1 x dx ＞0”是“t 2 +t-2＞0”的必要不充分条件
D.
存在实数m，使2与m-1的等比中项为m
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举一反三
【单选题】Since he lost his job ______.
A.
dozens of people have rung him but haven't given him a job
B.
he has applied for jobs but nobody ever replies to his letters
C.
he has not seen any other jobs advertised
D.
only four times have employers asked him to come and see them
【单选题】关于胎儿附属物,以下各项正确的是
A.
胎盘有防御感染的功能，乙肝病毒不能通过胎盘
B.
胎盘有合成雌激素、孕激素的功能 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
妊娠期羊水量保持稳定，约 500ml 左右
D.
脐带中有 2 条脐静脉和 1 条脐动脉
E.
母 儿之间的气体交换，主要通过胎膜 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【简答题】国家规定的安全色是哪几种颜色？含义是什么？
【简答题】国家规定的安全色有哪几种颜色？其含义是什么？
【单选题】In the opening paragraph, why does the author prefer to use the term 'desiredness'?
A.
Because it seems mare catchy and refers to a specific semantic field
B.
Because nobody else has ever used the word before, it therefore exemplifies the author's original and unique ideas
C.
Because it helps native English speakers to grasp the conceptual idea expressed in this passage
D.
Because it clears any misunderstanding relating to the distinction made in the first paragraph
【单选题】In the opening paragraph, why does the author prefer to use the term 'desiredness'?
A.
Because it seems more catchy and refers to a specific semantic field.
B.
Because nobody else has ever used the word before, it therefore exemplifies the author's original and unique ideas.
C.
Because it helps native English speakers to grasp the conceptual idea expressed in this passage.
D.
Because it clears any misunderstanding relating to the distinction made in the first paragraph.
【多选题】持续、稳定、高速的GDP增长将会促进证券市场价格上涨，其原因在于( )。
A.
伴随总体经济增长，公司经营效益提高，而投资风险减小
B.
伴随总体经济增长，人们对未来经济形势形成良好预期，投资积极性提高
C.
伴随总体经济增长，居民收入水平得以提高，导致投资需求增加
D.
伴随总体经济增长，政府采取紧缩的货币政策以控制经济的过速增长，使得企业的资金持有成本降低、企业利润增加
E.
伴随总体经济增长，宏观环境整体利好，有价证券得到全面升值
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