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【单选题】
下列用“ ”或“ ”“=”等符号表示两个集合关系错误的是A.
{1,3,5} {1,2,3,4,5}
B.
{ x| x=4m ,m Z } {x| x=2m ,m Z}
C.
Æ {0}
D.
{x| x=2m-1 ,m Z} ＝{x| x=2m+1 ,m Z}
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【简答题】试述二氢黄酮、异黄酮、花色素水溶液性比黄酮大的原因。
【单选题】Immigration into the U.S. over the past century has caused the percentage of immigrants in the U.S. population to
A.
fall steadily over the entire century.
B.
rise steadily over the entire century.
C.
fall steadily until the 1970s and increase thereafter.
D.
remain relatively constant over the time period.
E.
rise steadily until the 1970s and fall thereafter.
【简答题】The percentage of...is s____________ l_____________ (s___________) than that of... ...的比例比...的比例略高(低)。
【单选题】反治法的定义是:
A.
顺从疾病的本质而治的一种治疗方法
B.
逆着疾病的本质而治的一种治疗方法
C.
逆着疾病的症状而治的一种治疗方法
D.
顺从疾病的某些假象而治的一种治疗方法
E.
以上均非
【简答题】A．The percentage is high. B．The percentage is low. C．The amount of the population is not so low. D．It is not mentioned in the passage.
【简答题】A．The percentage is high. B．The percentage is low. C．The amount of the population is not so low. D．It is not mentioned in the passage.
【简答题】The percentage of ... is larger / smaller than that of ... 暑期参加兼职的同学的百分率要略高于往年。
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