下图所示是铁丝在氧气中燃烧的全过程。请回答下列问题： (1)选_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题实验题

下图所示是铁丝在氧气中燃烧的全过程。请回答下列问题：

(1)选用的铁丝如果表面有绣，应用进行处理，这个变化属于变化。

(2) ①铁丝为什么要绕成螺旋状? 。

② 集气瓶内为什么要预先装少量水或铺一层细砂?

③ 点燃火柴后，铁丝插入集气瓶中的适宜时刻和方法是

答案

（1）砂纸打磨去锈；物理

（2）①为了增大与氧气的接触面积

②防止燃烧产生的熔化物溅落瓶底，使瓶底炸裂

③待火柴即将燃尽时，从瓶口往下缓缓伸入瓶中

完形填空

“Hi, Mommy, what are you doing?” asked Susie, who was only six years old. “I’m making a casserole(炖锅菜) for Mrs. Smith next door, __36__ Mrs. Smith is very sad. She lost her daughter and has a __37__ heart. We need to take care of her a little while.” Said her mother. “ Why, Mommy?”
“You see, Susie, when someone is very, very sad, they have __38__ doing the little things like making dinner or other housework. Because we’re __39__ of a community and Mrs. Smith won’t ever be able to talk with her daughter or hug(拥抱) her. You are a very __40__ girl, Susie; maybe you’ll think of __41__ way to help take care of Mrs. Smith.”
Susie thought __42__ about this challenge and how she could do her __43__ on caring for Mrs. Smith. A few minutes later, Susie knocked on her door. After a few moments, Mrs. Smith __44__ the knock with a “Hi, Susie.”
Susie noticed that Mrs. Smith didn’t have that familiar musical __45__ about her voice when she __46__ someone.
“What can I do for you, Susie?” asked Mrs. Smith.
“My mommy says that you lost your daughter and you’re very, very sad with a broken heart.” Susie __47__ her hand out shyly. In it was a Band-Aid. “This is for your broken heart.” Mrs. Smith knelt down and hugged Susie. Through her __48__ she said, “Thank you, darling girl, this will __49__ a lot.”
Mrs. Smith __50__ Susie’s act of kindness and took it one step __51__. She bought a small key ring with a picture frame(框架) ---- the ones __52__ to carry keys and display a family __53__ at the same time. Mrs. Smith placed Susie’s Band-Aid in the frame to __54__ her to heal a little every time she sees it. It has become her symbol(象征) for healing, while not __55__ the joy and love she experienced with her daughter.

B．answered to

D．remembering

单项选择题

6个月男孩，主因发热3天，惊厥2次收入院。入院查体：体温38.7℃，烦躁不安，心率120次／分，心音有力，双肺呼吸音清，未闻杂音，腹软，前囟膨隆，张力较高，为明确诊断，此患儿首先应进行的检查是（）

A.头颅B超

B.血气分析

C.超声心动图

D.胸片

E.脑脊液检查