下面不是新石器时代的石器最常见的有()。A、斧 B、锛 C、锤 D、镞

题型:单项选择题

问题:

下面不是新石器时代的石器最常见的有()。

A、斧

B、锛

C、锤

D、镞

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题型:单项选择题

实验员从8种化学药品中选出4种,放在4个不同的瓶子里,如果甲、乙两种药品不宜放入1号瓶,则不同的放法有______种.

题型:单项选择题

人身上的许多器官其工作原理与我们所学的物理知识有联系,下列说法正确的是[ ]

A、晶状体相当于凹透镜

B、视网膜上成的是正立缩小的像

C、近视眼应配戴凸透镜

D、远视眼看报时把报纸拿远才能看清

题型:单项选择题
某学校为了了解初二学生的身高情况,随机抽测50名学生的身高后,所得部分资料如下(身高单位:cm,测量时精确到1cm):
身高148151154155157158160161162164
人数1121234345
身高165166167168170171173175177179
人数2361423111
若将数据分成8组,取组距为4cm,相应的频率分布表(部分)是:
分      组频       数频     率
147.5~151.520.04
151.5~155.530.06
155.5~159.550.10
159.5~163.5110.22
163.5~167.5
______

______
167.5~171.5
______ 

______ 
171.5~175.540.08
175.5~179.520.04
合  计501.00
请回答下列问题:
(1)样本数据中,身高的众数、中位数各是多少?
(2)填写频率分布表中未完成的部分;
(3)若该校初中二年级有840名学生,请你估计该年级学生身高在172cm及以上的人数.
题型:单项选择题

病历摘要:男性,28岁,右眼视物变形伴黑影十天,不伴有眼红、眼痛史,眼部检查:视力右眼0.6+0.5DS→0.8,左眼0.8不能矫正。右前部未见异常,玻璃体可见少许漂浮物,眼底黄斑区有明显小点状渗出物,中心凹反光消失,左眼底黄斑区色素紊乱,中心凹反光暗淡。

从病史与初步检查,你认为是何种疾病?()

A.双眼屈光不正

B.双眼远视眼

C.双眼青年性黄斑变性

D.双眼黄斑水肿

E.右眼中浆

F.左眼陈旧性中浆

G.双眼Leber氏病

H.双眼视网膜炎

题型:单项选择题

When I was looking for a Christmas present for my daughter in a toy store, a nicely dressed little girl, with some money in her little hand, was looking at some beautiful dolls. When she saw a doll she liked, she would ask her father if she had enough money. He usually said yes.
At the same time, a boy, with old and small clothes, was looking at some video games. He, too, had money in his hand, but it looked no more than five dollars. Each time he picked up one of the video games and looked at his father, he shook his head.
The little girl had chosen her doll, a very beautiful one. However, she noticed the boy and his father. She saw the boy give up a video game with disappointment and walk to another corner of the store.
The little girl put her doll back to the shelf and ran over to the video game. After she talked to her father, she paid for the video game and whispered(耳语) to the shop assistant.
So the boy got the video game that he wanted for free—he was told it was a prize from the store. He smiled happily, although he felt it was so incredible. The girl saw all this happen. She smiled, too.
When I walked out of the store to my car, I heard the father ask his daughter why she had done that. I would never forget their short talk. "Daddy, didn’t Grandma want me to buy something that would make me happy"
He said, "Of course, she did."
"Well, I just did!" With that, the little girl started skipping towards their car happily.

The boy ______.

A. wore new and nice clothes
B. had much money in his hand
C. was from a poor family
D. wanted to get a doll very much

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