有19瓶水,其中有18瓶质量相同,另有一瓶是盐水,比其它的水稍重一些,至少称__

题型:解答题

问题:

有19瓶水,其中有18瓶质量相同,另有一瓶是盐水,比其它的水稍重一些,至少称______次保证找出这瓶盐水.

考点:找次品
题型:解答题

Can you think of an occasion ______ you can use this gesture.

A.which

B.that

C.when

D.on that

题型:解答题

期内索赔制是指保险人负责赔偿()

A.在保单有效期间内由被保险人向保险人提出的索赔

B.在保单有效期间内由受害人向被保险人提出的索赔

C.在保单有效期间内发生的应由被保险人负责的损失

D.在保单有效期间内发现的应有被保险人负责的损失

题型:解答题

One event that helps educate young people about things they can do for others is National Youth Service Day (NYSD). Every year on this day, organizations all over the country celebrate young volunteers, educate young people about how they can help their country, and invite them to participate in service projects. Former Secretary of State Colin Powell said, “National Youth Service Day honors young volunteers and is an invitation to others to join hands and do our part as Americans.”

Founded in 1988, NYSD originally took place on a Tuesday. Now the event lasts from Friday until Sunday so that more people can participate in it. More than 200 organizations work together to create thousands of projects each year. Millions of young people across the United States take part in these service projects.

Long before the event, people, community groups, schools, and nonprofit organizations think of ways to meet their communities’ needs. Then, they plan projects for young volunteers. Projects include bringing food to hungry people, tutoring younger children and helping senior citizens. During the event, young people from the community do things like planting neighborhood gardens and cleaning up local parks.

The organizations that contribute to NYSD believe that volunteering and community service are important activities for people of all ages, but especially for young people. Young people who volunteer are more likely to do well in school, vote, and contribute to charities. More important, they help other people and make the world a better place for everyone.

小题1:The aim of National Youth Service Day is to _______.

A.educate young people on responsibility

B.invite young people to meet each other

C.encourage young people to serve others

D.celebrate the growth of young people小题2:On National Youth Service Day, young volunteers will _______.

A.do some cleaning in public places

B.prepare food for hungry people

C.plant vegetables and fruit

D.help old people to learn小题3:The purpose of writing this passage is to _______.

A.warn young people not to affect their schooling during volunteering

B.keep a record of how young people celebrate their festival

C.introduce an event — National Youth Service Day

D.advise young people to be cooperative when volunteering

题型:解答题

什么叫碳素钢?碳素钢按质量如何分类?

题型:解答题

提高精甲醇中的水含量,可以提高精馏塔的()。

A、温度

B、回流量

C、液位

D、采出量

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