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【单选题】
“西湖春色归，春水绿于染”“日出花红胜火，春来水绿如蓝”等诗句中湖水、水泛起绿色，是因为（ ）A.
春天气温升高，岸边苔藓植物生长旺盛，有些苔癣植物流到湖水、
B.
春天降水增多，空气中含水量升高，因而出现发霉现象
C.
春天气温升高，藻类植物大量繁殖，这些绿色的小生命漂浮在江水、湖水中
D.
春天的天空格外明媚，岸边树木花草也长出了绿叶；江水、湖水格外绿
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【简答题】病历摘要男性，28岁。反复水肿、尿少、尿蛋白5年，恶心、食欲缺乏、头晕1年、心悸、气促3天。患者反复眼睑及双下肢水肿、尿少5年，可自行消退或利尿后消退。曾在门诊查尿常规示：蛋白（+～++），偶有红细胞增多。近1年出现头晕、头痛、乏力、食欲缺乏和恶心。10天前受凉后咳嗽、咳白色黏痰，口服阿莫西林后症状缓解。近3天心悸、气促、夜间不能平卧，为进一步诊疗入院。既往史：无肝炎、结核、高血压病和心脏病病史，...
【单选题】Which of the following statements is true? a. Increases in a country's endowments of land, labor, and capital will lead to long-run economic growth . b. Improvements in the technology used in producti...
A.
B.
C.
D.
D
【单选题】A change in which of the following will not alter the demand curve for rental housing?
A.
The price of houses.
B.
Rental prices.
C.
Incomes of consumers.
D.
Energy prices.
E.
Growth in the community.
【单选题】The Phillips curve is an extension of the model of aggregate supply and aggregate demand because, in the short run, an increase in aggregate demand increases prices and
A.
decreases unemployment.
B.
decreases growth.
C.
increases unemployment.
D.
decreases inflation.
【多选题】硫酸结合的特点包括
A.
硫酸结合与葡萄糖醛酸结合一样普遍
B.
硫酸结合不如葡萄糖醛酸结合普遍
C.
相对于酚羟基，醇羟基不易形成硫酸酯
D.
硫酸可结合甾体激素、甲状腺激素等
【单选题】Last year, the world demand curve for copper shifted rightward due to continued economic growth in China and other emerging economies. Also, the supply curve for copper shifted leftward due to strikes...
A.
higher equilibrium copper prices and unambiguously lower quantities.
B.
higher equilibrium copper prices and unambiguously higher quantities.
C.
higher equilibrium copper prices and either higher or lower quantities.
D.
lower equilibrium copper prices and either higher or lower quantities.
【简答题】下列程序段所代表的算法的时间复杂度为( )。 x=n; y=0; while (x>=(y+1)*(y+1)) y++; (A)O(n) (B)O(n2) (C)O(log2n) (D)O( )
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