搜题请搜索小程序“爱下问搜题”
问题 选择题

斜向上方抛出的物体在运动中（　　）

A．速度一直在减小

B．水平方向速度先增大后减小

C．在最高点的速度为零

D．竖直方向可认为做竖直上抛运动

答案

A、物体在上抛过程，水平速度保持不变，而竖直分速度先减小后增大；故合速度先减小后增大；故A错误；

B、因水平方向不受外力，故水平方向速度不变；故B错误；

C、最高点时竖直速度为零；而水平速度不为零；故合速度不为零；故C错误；

D、竖直方向有向上的初速度，且加速度为向下的重力加速度，故可以认为做竖直上抛运动；故D正确；

故选：D．

单项选择题

When I first entered university, my aunt, who is an English professor, gave me a new English dictionary. I was (16) to see that it was an English-English dictionary, also known as a monolin-gual dictionary. (17) it was a dictionary intended for non—native learners, none of my classmates had one (18) , to be honest, I found it extremely (19) to use at first. I would look up words in the dictionary and (20) not fully understand the meaning, I was used to the (21) bilingual dic-tionaries, in which the words are (22) both in English and Chinese, I really wondered why my aunt (23) to make things so difficult for me. Now, after studying English at university for three years, I (24) that monolingual dictionaries are (25) in learning a foreign language.

As I found out, there is (26) often NO perfect equivalence(对应) between two (27) in two language. My aunt even goes so far as to (28) that a Chinese "equivalent" can never give you the (29) meaning of a word in English! (30) , she insisted that I read the definition(定义) of a word in a monolingual dictionary (31) I wanted to get a better understanding of its meaning. (32) , I have come to see what she meant.

Using a monolingual dictionary for learners has helped me in another important way. This dictionary uses a(n) (33) number of words, around 2,000, in its definitions. When I read these definitions, I am (34) exposed to (接触)the basic words and learn how they are used to explain objects and ideas. (35) this, I can express myself more easily in English.

30（）

A. Rather

B. However

C. Therefore

D. Instead
查看答案
单项选择题

①立秋至处暑，秋阳肆虐，温度较高，加之时有阴雨绵绵，湿气较重，天气以湿热并重为特点
②秋季的气候是处于“阳消阴长”的过渡阶段
③由于人体的生理活动与自然环境变化相适应，体内阴阳双方也随之发生改变
④因此，秋季养生在对精神情志、饮食起居、运动导引等方面进行调摄时，应注重一个“和”字
⑤“白露”过后，雨水渐少，天气干燥，昼热夜凉，气候寒热多变，稍有不慎，容易伤风感冒，许多旧病也易复发。被称为“多事之秋”
⑥故有“秋老虎”之说
将以上6个句子重新排列，语序正确的是( )。

A．②①③④⑤⑥
B．①③⑤④②⑥
C．②①⑥⑤③④
D．②⑤④①③⑥
查看答案