【单选题】抛硬币20次,正面12次,反面8次.如果抛到正面得3分,抛到反面得1分,则平均得分是________,得分的方差是________
【简答题】句型转换。 1.I think there will be more pollution in the city.(改为否定句) I think there be more pollution in the city. 2.I have more apples than Lucy.(改为同义句) Lucy _______ ________ apples than I. 3.It'll take m...
【简答题】横轴表示X商品的数量,预算线绕着它与纵轴的交点逆时针移动的原因是(
)A. 商品X的价格上升 B. 商品Y的价格上升 C. 商品X的价格下降 D. 商品Y的价格下降
【单选题】下列关于水循环的叙述,错误的是
A.
水资源处于不断地循环更新过程中,因而取之不尽 用之不竭
B.
海陆间水循环和陆地循环都能使水资源得到不断的更新
C.
水循环实现了陆地和海洋之间物质迁移和能量交换
【单选题】— There are more and more Internet crimes. — ___________________.
A.
I think we should introduce more regulations to supervise the Internet.
B.
It's none of your business.
C.
It has nothing to do with me.
【单选题】横轴表示X商品的数量,预算线绕着它与纵轴的交点逆时针移动的原因是
【单选题】The more I think about him, the more reasons I find for loving him _____ I did. [ ]