下列说法中，正确的是_刷题宝

题干

下列说法中，正确的是（　　）

A：同一条弦所对的两条弧一定是等弧

B：长度相等的两条弧是等弧

C：正多边形一定是轴对称图形

D：三角形的外心到三角形各边的距离相等

上一题下一题 0.0难度选择题更新时间:2019-05-31 09:42:22

答案(点此获取答案解析）

C

同类题1

从显微镜下看到一个正在分裂的动物细胞，如图所示，则此动物的初级卵母细胞中，四分体数、染色体数、同源染色体对数、DNA分子数依次是（）

同类题2

阅读理解(D)
   Sharon's teacher told them that people should protect the environment. But to keep it clean, Sharon had to find it first. After breakfast, she went outside to look.
   Sharon met Herman, a squirrel(松鼠). She asked him about the environment. Herman said, "The environment is everywhere you go. The air you just breathed is part of it. The environment is the air, the water, the soil and our food. It's everything around us." Sharon thought and thought. "I think the Sun isn't part of the environment." But Herman said, "Oh，yes, it is. The sun gives you a vitamin(维他命）you need, Vitamin D. So we should protect the environment. It's important for your life. We can't throw rubbish everywhere. We can't waste things anymore. And we should stop polluting the river. And..."
   Sharon said, " Wow, it's a big job to clean the whole environment. I think I will be busy from now on."

同类题3

A

This cutting Food Box has 31 pieces, including 8 pieces of wooden food, a cutting board and two wooden knives. It lets kids cook on their own and hear real cutting sounds. The toy is for children 3 years to 6 years. It helps a lot. Here are some activities.

●Ask the child to tell the name of each food and whether it is a fruit or vegetable.

●Place the food in a row to ask the child to count the number of food.

●Ask the child to place the watermelon on the cutting board to cut it into four pieces.

We care about your comments（评论）. Please call us at 800-284-3948. If you buy it before May, you can save up to 50%.

Dear parents,

Please make sure the following, in order to prevent your children from carrying heavy school bags:

●Make sure that your child follows the timetable strictly. The latest timetable is always available on the school website 21世纪教育网sksbs.edu.my.

●Encourage your child to use the school lockers.

●Ensure that your child carries the bag properly. Put on both bag straps, and do not carry on one shoulder only.

●Always buy light bags.

同类题4

小丽最近总觉得不舒服，去医院检查发现每立方米血液中有白细胞18000个（白细胞正常值为每立方米5000～10000个），这种现象说明小丽患有（　　）

同类题5

回忆《西游记》原著，根据要求回答问题。

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