问题 选择题

“海南毒豇豆”中含水胺硫磷(C11H16NO4PS)是一种速效广谱硫逐式一硫代磷酰胺类杀虫、杀螨剂.水胺硫磷能通过食道、皮肤和呼吸道引起中毒.下列有关水胺硫磷说法正确的是(  )

A.水胺硫磷属于无机化合物

B.水胺硫磷中各元素的质量比为11:16:1:4:1:1

C.一个水胺硫磷分子中含有两个氧分子

D.水胺硫磷由6种元素组成

答案

A、根据含有碳元素的化合物叫有机化合物,简称有机物.碳的氧化物、碳酸盐、碳酸虽含碳,但其性质与无机物类似,因此把它们看作无机物.进行判断,水胺硫磷属于机化合物;故A说法错误;

B、根据标在元素符号右下角的数字表示一个分子中所含原子的个数;可知水胺硫磷中各元素的原子个数比

为 11:16:1:4:1:1;故B说法错误;

C、根据标在元素符号右下角的数字表示一个分子中所含原子的个数;可知一个水胺硫磷分子中含有4个氧分子原子;故C说法错误;

D、根据水胺硫磷的化学式(C11H16NO4PS)分析可知其由C,H,N,O,P,S 6种元素组成;股D十分正确.

故选D.

阅读理解

A young man from a village called Nawalapitiya married a young woman from Maliyuwa, a nearby village. They lived with the man’s big family—his parents, his brothers, their wives and children. The family kept an elephant, in which the young woman soon took a great interest. Every day she fed it with fruit and sugar.

Three months later the woman went back to her parents’ home, having quarreled with her husband. Soon the elephant refused to eat and work. It appeared to be ill and heart-broken. One morning after several weeks the animal disappeared from the house.

It went to the woman’s home. On seeing her, the elephant waved its trunk and touched her with it. The young woman was so moved (感动) by the act of the animal that she returned to her husband’s home.

小题1:The writer wrote the story in order to ______.

A.show that elephants are very clever

B.tell how a woman trained a wild animal

C.show that women care more for animals than men do

D.tell how an animal reunited (团圆) a husband and wife小题2:The woman left her new home ______.

A.to visit her own parents in Maliyuwa

B.to see if the elephant would follow her

C.because she was angry with her husband

D.because she was tired of the large family小题3:After the young woman left her husband’s home, the elephant ______.

A.returned to the forest

B.was sad because it missed her

C.went to look for a new home

D.was sick because nobody fed it小题4:The young wife went back to her husband because ______.

A.she knew he had sent the animal to her

B.the elephant had come to look for her

C.her parents told her to

D.she missed her new home

单项选择题