1.选择题- (共1题)
1.M是一种重要材料的中间体,结构简式为:
.合成M的一种途径如下 


A~F分别代表一种有机化合物,合成路线中的部分产物及反应条件已略去.
已知:①Y的核磁共振氢谱只有1种峰;②RCH=CH2 {#mathml#}{#/mathml#} RCH2CH2OH;
③两个羟基连接在同一个碳原子上不稳定,易脱水.请回答下列问题:
2.单项选择- (共5题)
2.
The film ________ the World War II was made in Shanghai.
A.base on | B.based on | C.base in | D.based in |
3.
How I was _______when I heard the _______ news!
A.excited; excited | B.exciting; exciting. |
C.excited; exciting | D.exciting; excited |
5.
However, even on TV and the radio you will hear differences in the way ______ people speak.
A.that | B.in which | C./ | D.all of the above |
试卷分析
-
【1】题量占比
选择题:(1道)
单项选择:(5道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:5
7星难题:0
8星难题:0
9星难题:0