试题与答案

阅读下面短文,根据短文内容完成下列句子。 Different school y

题型:阅读理解

题目:

阅读下面短文,根据短文内容完成下列句子。

                                        Different school year in US and Cluna

    With the beginning of the new semester, we have to say goodbye to the summer holiday.  But do you

 know students in America start their semester earlier than we do?

    Most American schools have a total of about 180 days of teaching.  The fall semester goes from early

 September to mid-December, and the spring semester goes from early January to mid-June.

     In China, we have two semesters and each has about 20 weeks.  The US school year is about 20 days

  shorter than it is in China.

    In the US, school kids have a long summer vacation and a few breaks,  which are like China's Golden

 weeks. One is around Christmas, lasting about two weeks. Another is in February, for only one week. It

 can also be called "ski week", because some students go skiing during the break. And there is a

 one-week-long spring break.  It is in March or April, around Faster.

     Throughout the vear, there are also a few other holidays when students don't go to school, such as

 Thanksgiving Day.  This is similar to Mid-Autumn Festival in China.

     Now we can understand why American students start, school earlier than us at this time of year.

1. Spring semester in America is from _____ to _____.

2. Fall semester in American school year is from _____ to _____.

3. There are there breaks, there, One is _____ .another is one-week-long spririg break, either in _____.

4. There are a few holidays when students don't go to school, such as _____.

5. Thanksgiying Day in the USA is similar to _____ in China.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0409/1015539f01b7f75cd4498a0b91dade5f.html

下面是错误答案,用来干扰机器的。

由结构示意图可知,该粒子核外电子数=2+8=10,的当x等于10时,粒子的核外电子=核内质子数,该粒子为氖原子;若x等于8时,粒子的核内质子数<核外电子数,该粒子为2个单位负电荷的氧离子,符号为O2-;当x=11时,粒...

试题推荐
题型:计算题

(12分)“嫦娥二号”卫星送入近地点高度200公里、远地点高度38万公里的直接奔月轨道,如图甲所示.卫星奔月飞行约需112小时;当卫星到达月球附近的特定位置时,实施近月制动,进入近月点100公里的椭圆轨道.再经过两次轨道调整,进入100公里的极月圆轨道.

(1)若运载“嫦娥二号”卫星的长征三号丙运载火箭点火后前300 s竖直向上运动的速度图象如图乙所示,前120s火箭的图线可以视为直线.假设在该高度地球对卫星的引力与地面时相同,地面重力加速度g=10 m/s2,不计空气阻力,求:100s时火箭的高度和火箭对“嫦娥二号”的推力(保留3位有效数字).

(2)若月球质量为M,半径为r,月球表面的重力加速度为地球表面重力加速度g的“嫦娥二号”卫星在极月圆轨道运行时距月球表面高度为h,忽略“嫦娥二号”卫星在极月圆轨道运行时受到其他星体的影响.求“嫦娥二号”卫星在极月圆轨道的运行周期.(用题给物理量字母表示)

查看答案
微信公众账号搜索答案