【单选题】Suppose Sam plans to buy only popcorn and soda. He has $40 to spend per week. A change in which of the following variables will change Sam's consumption possibilities? I. price of popcorn II. income...
【单选题】下列关于HIV的描述错误的是()
A.
根据血清学分型,HIV可以分为Ⅰ型(HIV-1)和Ⅱ型(HIV-2),其中HIV-2是主要流行型,HIV-1主要在非洲的少数国家呈局限性流行。
B.
HIV在分类上属于逆转录病毒科中的慢病毒亚科。
C.
可在人体外环境中生存,对热很敏感,一般60℃以上就可被杀死。
E.
HIV在繁殖过程中,不断杀伤宿主细胞,使CD4T淋巴细胞数目减少。
【单选题】The demand curve for microwave popcorn is linear. Which of the following definitely makes the demand for microwave popcorn more inelastic? (微波爆米花的需求曲线是线性的。以下哪一个肯定会使微波爆米花的需求更无弹性?——中文由在线翻译而来,仅供参考)
A.
a decrease in the price of microwave popcorn微波爆米花价格下跌
B.
an increase in the price of microwave popcorn微波爆米花价格上涨
C.
an increase in income收入增加
D.
a decrease in income收入减少
【单选题】Which of the following shifts the supply curve of popcorn leftward?
A.
a decrease in the price of popcorn
B.
an increase in the price of popcorn
C.
a technological development in the production of popcorn
D.
a decrease in the number of popcorn suppliers
E.
a decrease in the cost of producing popcorn
【多选题】党的七大提出的党的三大优良传统和作风是指( )。
【单选题】以下生活方式属于健康生活方式的是
C.
只要每周摄入总盐量合格,今天吃咸一点没关系,明天少吃就好了