食品安全应考虑的问题包括( )
①食物本身是否有毒 ②食品的保质期 ③无机盐含量 ④是否被农药等有毒物质污染
⑤维生素种类 ⑥食物含能量高低 ⑦食物的营养价值 ⑧食物是否变质发霉.
A:①③⑤⑦
B:②④⑥⑧
C:①②④⑧
D:③⑤⑥⑦
判断下列各组单词划线部分的发音是否相同,相同的写正确,不同的写错误。
①____ A. run B. fun C. sun
②____ A. duck B. full C. jump
③____ A. box B. not C. old
④____ A. cold B. nose C. home
Reader's Travel Photography Competition
This month's images include some original and brilliant shots. The overall 2018 winner will receive a $200 holiday ticket and go on a 16-night wildlife holiday.
Doug Scott
Guess what the young monk is doing! He is playing with his smart phone in secret.
PAUL GOLDSTEIN JUDGE: Smart phones have taken over the world. Even without the photographer's caption there is composition, humor and fun here. To the outsider, he could be having a short sleep, or lost in meditation. My eyes stop on this for a while and the admission of smart phones cannot be changed in any corner of the world.
Eloise Campbell
I was able to follow this young eagle hunter and his eagle in the mountains of Mongolia and watched how it was trained. Though the bond between them was new, to me it seemed unbreakable—they were coexisting peacefully with each other.
Adam Cunningham White
This shot grasps the moment when we had to change direction with this group of around 300 migrating reindeer in northern Sweden. They can become confused very quickly, making this moment risky. They could run in different directions immediately, making it difficult to get them back into a group.
Nick Dale
This is a close-up of the left eye of a zebra.
PAUL GOLDSTEIN JUDGE: Perfect, I have seen these before but rarely done with this competence. The depth of field is exactly right. The bold cropping and blue to the left make people interested. Zebras are easy to photograph but not often this well.
将10g质量分数为20%的氢氧化钠溶液与20g质量分数为10%的硫酸溶液混合后,下列物质中不能与该溶液发生反应的是( )