题干

根据短文内容, 选择正确答案。

    Do you want to be a volunteer(志愿者)?Maybe you need some ideas to get you started. Here are just a few. You can pick(挑选)what you really love to do.

    Help kids learn and grow. Be a big brother or big sister at an after-school care center. You can help little kids to learn or play with them.

    Give back during the holidays. Serve dinner to the homeless or volunteer at your local old people's home. Your local church and temple may also need your help.

Help at a local animal shelter(动物收容所). Most shelters depend on volunteers to keep the cats and dogs happy and well exercised. And when you’re walking dogs, you get some exercise, too.

    Protect the environment. Take part in a local park clean-up day. Plant a tree in the spring. Join a group to work together to protect your local river.

    Help sick people. Lots of us are close to people who have a medical problem. It can make you feel good to donate your time or money to the people with an illness. When you cheer them up, you also feel happy.

上一题 下一题 0.0难度 选择题 更新时间:2017-11-14 10:44:17

答案(点此获取答案解析)

同类题3

某些媒体报道“转基因植物油对人类的健康不利”,也有专家说“转基因植物油是安全的”,到底是否安全呢?某班初二学生针对这一问题进行了如下探究实验.

(一)实验器材:普通植物油,转基因植物油,稻谷若干,小白鼠若干,两个规格一样且空间足够大的铁笼等.

(二)该同学提出的问题:转基因植物油对人类的健康是否有影响.

(三)实验过程:

(1)将两个铁笼分别贴上甲组和乙组标签,选取两只身体健康状况良好、大小一致、性别相同的小白鼠,分别置于甲、乙铁笼中.

(2)称取一定重量的同种稻谷平均分成两份,分别拌适量且等量的普通植物油(A料)和转基因植物油(B料)待用.

(3)甲组饲喂适量A料,乙组饲喂____ (填等量或过量)B料.

(4)饲喂一段时间后,观察并记录甲、乙两组小白鼠的生长状况.

(5)预测实验结果和结论:

①若两组小白鼠的生长状况有明显差异,则说明转基因植物油对人类健康____ (填有或无)影响.

②若两组小白鼠的生长状况无明显差异,则说明转基因植物油对人类健康____ (填有或无)影响.

(四)请根据上述实验设计回答下列问题:

(1)请你为该同学做出假设,你的假设是:____ .

(2)该同学设置甲组的目的是____ ,该实验的实验变量是____ .

(3)该实验选取小白鼠的数目过少,会增大实验的____ ,导致实验结论可信度不高.