【单选题】足球比赛中,当守门员拿起球大脚开出后,若不计空气阻力,则下列表示足球在空中的受力图正确的是(G表示重力,F表示脚对球的作用力) ____。
【单选题】passage two questions 13 to 15 are based on the passage you have just heard 13
A.
a phenomenon of aging face because of facing computer for a long time
B.
a feature of screen-shape face because of people following fashion on the Internet
C.
a symptom of "turkey neck" because of people imitating the turkey
D.
a representatin of wrinkles because of people lifting their heads for long hours
【简答题】下图为天体系统示意图,S表示太阳,完成1—3题。 1、下列哪些部门,不太关注太阳活动的预报和研究 ①通信部门 ②气象部门 ③钢铁部门 ④航天部门 [ ] A、① B、② C、③ D、④ 2、该图表示的天体系统有 [ ] A、1级 B、2级 C、3级 D、4级 3、与地球上存在生物无关的因素是 [ ] A、月球绕地球旋转 B、日地距离适中 C、安全稳定的宇宙环境 D、地球上形...
【单选题】passage two questions 13 to 15 are based on the passage you have just heard 13
A.
set a limit to money spent each day by children
B.
make sure children don't sprnd it at once
C.
learn about what children want with the money
D.
teach children to make a budget from their experience
【单选题】下列连线能正确表示生物与其气体交换部位的是( ) ①蚯蚓--体壁 ②蝗虫--气门 ③鲫鱼--鳃 ④家鸽--肺和气囊 ⑤鲸--肺.