把一根火柴梗平放在蜡烛的火焰中，约1s后取出，可观察到火柴梗（_爱下问搜题

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问题选择题

把一根火柴梗平放在蜡烛的火焰中，约1s后取出，可观察到火柴梗（　　）

A．均匀的被烧焦

B．放置在外焰部分被烧黑最重

C．放置在焰心部分被烧黑最重

D．放置在内焰部分被烧黑最重

答案

答案：B

题目分析：

选项A火焰的温度不均匀，故选项错误；

选项B在外焰部分被烧得最黑，外焰与氧的接触面积最大，燃烧最充分温度最高，使火柴梗碳化变黑．故选项正确；选项C在焰心部分被烧得最轻，几乎发白．故选项错误；选项D在内焰部分被烧得发黄或微黑，故选项错误；故选：B

完形填空

My grandmother became a widow in 1970. Shortly after that, we went to the   shelter to pick out a dog to keep her   . Grandma decided on a little dog with a reddish-brown spot above each eye.   these spots, the dog was named Penny.
Grandma and Penny quickly became very   to each other, but that attachment grew much stronger about three years later   Grandma had a stroke（中风）. Grandma could no longer   , so when she came home from the hospital, she and Penny were   companions.
After her stroke, it became a real   for Grandma to let Penny in and out because   was at the bottom of a flight of stairs. So a mechanism（机械装置）using a rope and pulley（滑轮）was     from the door to a handle at the top of the stairs. Grandma just had to pull the handle to open and close the door. If the store was     Penny’s favorite dog food, Grandma would make one of us   Penny browned beef with potatoes in it. I can remember     my grandmother by saying that she loved that dog better than she loved her family.
As the years passed, it was not   for Grandma and Penny to separate each other. If Grandma went to take her nap（打盹）, Penny stayed by her side until she   . As Penny aged, she could no longer jump up on the bed, so she     on the rug （垫子）beside the bed. If Grandma went into the     , Penny would walk along beside her, wait outside the door and accompany her     to the bed or chair. Grandma never went anywhere without her _ companion by her side.
The time came when both my grandmother’s and Penny’s     were failing fast. After fifteen years of loving companionship, Grandma and Penny passed away within a few hours of each other.

A．In spite of

D．In front of

A．drawing attention to	B．making use of
C．breaking away from	D．making fun of

A．reading room

单项选择题

下列（）不属于“悉檀多”时期的印度数学家。

A.阿耶波多

B.马哈维拉

C.奥马.海亚姆

D.婆罗摩笈多