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冬天的降雪对于农作物越冬是有利的,“冬天麦被,来年枕着馒头睡”这句谚语就是具体表现。据此回答下列各题。 4.关于冬雪对越冬作物的好处描述正确的是 (10.0分) A. 冬雪覆盖地面时可以反射大量太阳辐射,导致地温低,可以冻死害虫 B. 冬雪覆盖可以减少土壤热量的散失,阻挡雪面上寒气的侵入,起到保温作用 C. 冬季部分积雪融化,缓解了一年中主要的旱情 D. 覆盖的冬雪融化后可以大量增加土壤有机质含量,提高土壤肥力
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【单选题】As for how to celebrate New Year's Eve, someone suggested that we hold parties at which we can ________ small gifts and eat heart-shaped cakes.
A.
change
B.
exchange
C.
shift
D.
communicate
【单选题】_____ we celebrate a festival it changes a little and in that way we keep our culture alive.
A.
Some time
B.
Each time
C.
From time to time
D.
Many a time
【单选题】男性,35岁黄疸已1月,右上腹轻微胀痛,食欲不振,经内科治疗无效。查体肝大,胆囊增大,血胆红素17/anol/L,AST 70单位,AKP 45单位,AFP5ng/ml,可能诊断是()
A.
黄疸性肝炎
B.
胆总管结石梗阻
C.
肝癌
D.
肝硬化晚期
E.
壶腹周围癌
【单选题】Unit lecture: Mass Media and Diffusion of Innovation
A.
mass media has limits: dependent on literacy or availability
B.
mass media has limits: no human interaction
C.
mass media has limits: can't convert people to new opinions
D.
none of the limitations are mentioned in the text
【单选题】关于顿挫感染,下列叙述中哪项正确
A.
因宿主细胞内有相应抑制物
B.
因宿主细胞DNA有关基因激活
C.
因宿主细胞缺乏有关酶
D.
因感染病毒有核酸缺失
【单选题】男性,35岁黄疸已1月,右上腹轻微胀痛,食欲不振,经内科治疗无效。查体:肝大,胆囊增大,血胆红素17μmol/L,AST70单位,AKP45单位,AFP>5ng/ml,可能诊断是( )。
A.
黄疸性肝炎
B.
胆总管结石梗阻
C.
肝癌
D.
肝硬化晚期
E.
壶腹周围癌
【单选题】眼科超声检查时发现:玻璃体暗区内出现强弧形回声光带,界面整齐菲薄,面向前,光带与眼球壁之间为液性暗区,眼球运动时,可见光带轻度震颤,运动方向垂直于眼球壁,请指出这最中能是哪种疾病?
A.
部分性视网膜脱离
B.
完全性视网膜脱离
C.
陈旧性视网膜脱离
D.
脉脱性视网膜脱离
E.
牵引性视网膜脱离
【单选题】We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China these months. [     ]
A.
nineteen
B.
ninety
C.
nineteenth
D.
ninetieth
【单选题】听力原文: Mass media is the term used to denote, as a class, that section of the media specifically conceived and designed to reach a very large audience. It emerged in the 1920s with the advent of nation...
A.
Influence of mass media on our lives.
B.
Profitability of mass media.
C.
Mass media and its short history.
D.
Mass media and politics.
【单选题】下列不属于系统配件选择方式的是()
A.
通过配件的分类列表来选择
B.
具体配件名称或配件编号选择配件
C.
系统设计的关键字检索完成配件选取
D.
到仓库中进行人工直接选取
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