问题 填空题

用“>、<、=”填空:

①沸点:液氧______液氮;

②人体的呼出气体中氧气含量______二氧化碳含量;

③X体积的酒精和Y体积的水混合得到Z体积酒精溶液则X+Y______Z;

④2克氯酸钾加热到完全分解产生氧气的质量______2克氯酸钾和0.5克二氧化锰加热到完全分解产生氧气的质量.

答案

①液氧的沸点是-183℃,液氮的沸点是-196℃,故填:>

②呼吸作用发生时人体会吸收一定量的氧气,呼出一定量的二氧化碳,故填:<

③分子间有间隔,两种液体混合,体积变小,是因为分子相互进入对方的分子间隔中,故填:>

④在此反应中二氧化锰是催化剂,只能改变反应的速率,不能增产,故填:=

阅读理解

Christmas Eve means a warm get-together with friends, a candlelight dinner, or perhaps a celebration at a pub for students. But, for Cai Yingjie, the night has a different meaning: helping beggars(乞丐)and the homeless(people without homes).

Cai, who is a student in journalism at Tsinghua, could be found at Beijing’s Wudaokou Light Railway Station that special evening. When she saw an old beggar, she took the cold, rough hands of the woman with her warm, clean hands, and gave the woman some warm bread and helped her put on a pair of new gloves.

The woman was surprised for a few seconds, then burst into tears, saying “for the first time I feel respected”.

Cai said, “A beggar’s life is very hard. That’s why I want to help them.”

Cai was one of 14 Tsinghua students spending Christmas Eve among the poor. They walked in the cold wind along the streets from 4 to 7 pm on Friday, visiting 15 beggars in Beijing’s Haidian District.

They brought bread and gloves with them, and stopped to greet beggars and offer them some of the warm food. Each beggar greeted them with a look of surprise.

“I know the activity can’t help much, but it’s meant to show our respect and care for beggars and the homeless who have been neglected for so long,” said Sun, head of the group. “And Christmas is a good time for that.”

小题1:What does Christmas Eve mean to the 14 Tsinghua students?

A.Taking 15 beggars to Tsinghua.

B.Getting together with friends.

C.Showing care to the beggars and the homeless.

D.Selling bread and gloves to the beggars.小题2:What does the beggar mean by saying “for the first time I feel respected”?

A.The beggar has been waiting for Cai for long.

B.The beggar hasn’t been shown care for so long.

C.The beggar has been respecting Cai for a long time.

D.This is the first time the beggar has seen Tsinghua students.小题3:What did each beggar feel when they received greetings?

A.Sad.

B.Amazed.

C.Frightened.

D.Proud.小题4:The word “neglected” in the last passage means _______.

A.protected

B.found

C.taken care of

D.given no enough care

单项选择题