问题 填空题

中央电视台正在直播的《长江行动》是央视与国家环保总局为保护长江水质、治理长江污染的执法行动.如果你是其中的一员,要粗略地测定江水样品的酸碱性强弱,你会建议使用______;若要测定江水中磷元素的含量,可用的试剂是钼酸铵[(NH42MoO4],其中钼(Mo)元素的化合价是______;净化水的操作有①静置 ②吸附 ③过滤 ④蒸馏等,其中净化程度由高到低的顺序是______(填序号);若要获得蒸馏水,蒸馏实验中的温度计是用于测量______的温度.

答案

用PH试纸可以测定溶液的pH.故填:、pH试纸(或pH计).

在钼酸铵中,铵根离子的化合价是+1价,氧元素的化合价是-2价,根据化合物中元素的化合价的代数和为零可以求出钼(Mo)元素的化合价是+6价.故填:+6.

净化水的操作中有静置、吸附、过滤、蒸馏等方面,净化程度由高到低的顺序是蒸馏、过滤、吸附、静置.故填:④③②①.

若要获得蒸馏水,蒸馏实验中的温度计是用于测量水蒸气的温度.故填:水蒸气.

阅读理解

In China, parents often tell their kids not to waste food. However, it's reported that a lot of food is wasted in restaurants every day.

Many people say when they eat out, they usually order a lot of dishes and they can't eat them up. One person in Chengdu, Sichuan Province says he takes away the leftovers. "Usually we'll have some leftovers after meals, because when I invite friends to eat out, I don't know how much they can eat, so I order lots of dishes to make sure everybody has enough food."

While another person in Fuzhou, Fujian Province says she never packs what is left on the dining table. "What I usually experience during eating out is a big meal. I seldom take away the leftovers because we often have other activities after the meals, and it's not convenient to take the leftovers. And when no one suggests taking away leftovers, I won't do so."

Some people say they only take away leftovers when they eat out with family, but not if they eat with friends or colleagues (同事).

Food waste means washing money as well as wasting precious resources (宝贵资源). When food is thrown away, it becomes rubbish and can be harmful to the environment.

We should realize how important it is to save food. It's wise to order proper food for our meals. If there're leftovers, it's better to take home. To save food, we should start with ourselves and start from now.

小题1:_________food is wasted in the restaurants of our country every day.

A.Little

B.Many

C.Few

D.Much小题2:The underlined word "leftovers" means________ in Chinese.

A.残留物

B.离开

C.剩菜

D.垃圾小题3:Which of the following is not mentioned?

A.They wan to give the leftovers to the servers.

B.The person never packs what is left on the dining table.

C.The leftovers can be harm to the environment.

D.Some people only take away leftovers when they eat out with family小题4:From the passage, it's necessary for us to________ when we eat out.

A.pack our favorite food

B.invite our friend for dinner

C.throw the leftovers away

D.order proper food for our meal and finish all on our plates小题5:The best tile of this passage is__________

A.Washing Money

B.Saving Food

C.Throwing Away Leftovers

D.Saving Money

单项选择题