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【单选题】
The speaker implies that _A.
parents can teach their children new sounds by asking them to imitate
B.
children who are good at imitating learn new sounds more quickly
C.
children still enjoy imitating even after they have learned to speak
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【单选题】A scientist In today's society we are now seeing more children under the age of twelve developing eating disorders. It is estimated that 40% of nine year olds have already dieted and we are beginning ...
A.
It is important to be thin.
B.
It is fashionable to have diet.
C.
It's a shame that children are being robbed of their childhoods.
D.
It's a shame that children are developing eating disorders.
【单选题】案例中,商店地面做法是 1、、 600 × 600 地板砖 2 、 20 厚 1:3 干硬性水泥砂浆结合或干混地面砂浆 DS M20 3 、表面撒水泥粉 其中20厚 水泥砂浆结合或干混地面砂浆 DS M20用处是:
A.
用于找平层，
B.
用于粘贴地板砖
C.
用于防水
D.
用于保温
【单选题】已知G是合成某高分子化合物的原料，只含C、H、O三种元素，5.9g物质G能与1mol/LNaOH的溶液100mL恰好完全反应，0.1mol物质G与足量金属钠反应在标准状况下生成2.24L氢气，分子结构中含有一个甲基，A的分子式为C 8 H 13 O 2 Br，有机物
A.
B.
C.
D.
E.
F.
G之间的相互转化关系如图所示： （1）写出C的结构简式：______． （2）A中官能团名称是：______． （3）B的同分异构体中属于酯的有多种，任写其中三种属于酯类的结构简式：______，______，______． （4）写出D→E化学反应方程式：______． （5）写出反应①化学反应方程式：______ （6）写出由F和G在一定条件下合成高分子化合物的化学反应方程式：______．
【简答题】境又分为 物境 和
【简答题】We are now enjoying the cool air in the room. ____, the farmers are harvesting crops in the hot sun. A．Therefore B．Besides C．As a result D．In the meantime
【单选题】A scientist In today's society we are now seeing more children under the age of twelve developing eating disorders. It is estimated that 40% of nine year olds have already dieted and we axe beginning ...
A.
It is important to be thin.
B.
It is fashionable to have diet.
C.
It's a shame that children are being robbed of their childhoods.
D.
It's a shame that children are developing eating disorders.
【单选题】下列说法正确的为：
A.
反应的速率常数大，反应速率一定高；
B.
反应H 2 (g)+I 2 (g)=2HI(g)的速率方程为υ=kc(H 2 )c(I 2 )，因此该反应一定是基元反应；
C.
某催化剂用于合成氨，N 2 的转化率为0.2，现有一新催化剂使反应速率常数提高1倍，转化率将提高到0.4；
D.
反应的自发性高，不一定速率高。
【单选题】人类环境分物质环境和非物质环境两类，其中物质环境又分为自然物质环境和人工物质环境两类。下列所列环境中，属于人工物质环境的
A.
陆地
B.
河流
C.
水库
D.
花卉草木
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