题干

某人向放在水平地面上正前方的小桶中水平抛球,结果球划着一条弧线飞到小桶的前方,如图所示。不计空气阻力,为了能把小球抛进小桶中,则下次再水平抛球时,可能做出的调整为(     )

A:减小初速度,抛出点高度不变

B:增大初速度,抛出点高度不变

C:初速度大小不变,降低出点高度

D:切速度大小不变,增大揸出点高度

上一题 下一题 0.0难度 选择题 更新时间:2020-03-15 11:40:09

答案(点此获取答案解析)

A,C

同类题5

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

How To Study English In China

    English is obviously not the native language in China. Although many Chinese want to improve their English level to the amount needed in daily work, it's very hard when only a few people speak English around them. ____ Here are a few tips that might help.

Join a school with native teachers to guide you.

    ____ The more exposure you can get to these foreign teachers, the faster and better you're going to learn English. If a school doesn't give students maximum exposure to native English speakers' classes, find one that does.

Read English daily.

    This means using websites that are permitted in China, accessing English texts, newspapers and books. Read short stories in English. When you come across words you don't know write them down immediately. ____

Find some English speakers.

    Spend time with them and share conversations. There is nothing better for learning any language than finding native speakers of the language to practice with. When you speak, you are practicing every aspect of the language(except writing) in the most efficient way possible.

Memorize vocabulary.

    Write new words in a notebook every week, with English definitions and a sample sentence, not a Chinese translation. ____ Carry it with you everywhere you go. Even if you have a question about something that you see and you don't know the English word, write it down in your own language with the plan to look it up later and learn that word in English.

    ____ English is not well controlled by grammar rules. For every rule, there is an exception to that rule. Your time will be better spent in watching movies and learning from them than studying grammar for long hours. Find someone to write emails in English to or write a dairy every day.

    There are many other ways to improve your English. Come on!

A. Learn to write.

B. Watch an English film once a month.

C. What can you do to study more English?

D. There are many English speakers in China.

E. You can do this by writing in your notebook.

F. Follow a soap opera, comedy or radio program or TV drama.

G. You should be carrying a notebook with you everywhere you go just to write down something important.