问题 选择题

假设地球不自转,可能产生的现象是(  )

A.同一地点没有昼夜交替现象

B.地球上没有昼夜之分

C.全球各地都有极昼和极夜现象

D.同一地点有昼夜交替现象

答案

因为地球是一个不透明的球体,太阳始终只能照亮地球的一半,被照亮的一半称为昼半球,照射不到的一半,称为夜半球,使地球上出现昼夜之分;

地球绕地轴不停转动,叫地球自转.地球自转的方向是自西向东,自转的周期是一天,产生了昼夜交替(周期是一天)现象;

地球围绕太阳公转时,地轴与地球公转轨道的平面约成66.5°的固定夹角,这就使得一年内,太阳光线的直射点有规律地在南北回归线之间移动,各地正午的太阳高度也随之发生有规律的变化,除了赤道,地球其他地方一年中都有昼夜长短的变化,在南北极圈以内,甚至会出现“极昼”和“极夜”现象.

根据各种现象产生的原因可知,假设地球不自转,地球上也有昼夜交替现象,只不过周期变长.

故选:D.

判断题
阅读理解

What time is it?Most people are pretty accurate in their answer. And if you don’t know for sure, it’s very likely that you can find out. There may be a watch on your wrist; there may be a clock on the wall, desk, or computer screen; or maybe you’re riding in a car that has a clock in the dashboard .

Even if you don’t have a timepiece of some sort nearby, your body keeps its own beat. Humans have an internal clock that regulates (调节) the beating of our heart, the peace of our breathing, the discharge (排出) of chemicals within our bloodstream, and many other bodily functions.

Time is something from which we can’t escape. Even if we ignore it, it’s still going by, ticking away, second by second, minute by minute, hour by hour. So the main issue in using your time well is, “who’s in charge?” We can allow time to slip by and let it be our enemy. Or we can take control of it and make it our ally.

By taking control of how you spend your time, you’ll increase your chances of becoming a more successful student. Perhaps more importantly, the better you are at managing the time you devote to your studies, the more time you will have to spend on your outside interests.

The aim of time management is not to schedule every moment so we become slaves of a timetable that governs every waking moment of the day. Instead, the aim is to permit us to make informed choices as to how we use our time. Rather than letting the day go by, largely without our awareness, what we are going to discuss next can make us better able to control time for our own purposes.

小题1:The underlined word “ally” in Para.3 most likely means somebody or something that is____________.

A.your slave and serves you

B.your supporter an helps you

C.under your control and obeys you

D.under your influence and follows you小题2:The author intends to tell us that time __________.

A.could be regulated by a timepiece such as a clock or a watch

B.could be managed by the internal clock by human bodies

C.should be well managed for our own interest

D.should be saved for outside interests小题3:In the next part, the author would most probably discuss with you ________.

A.how to keep up with the times

B.how to make up for lost time

C.how to have a good time

D.how to make good use of time