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问题 单项选择题

下列属于人工合成甜味剂的是（）。

A.蔗糖

B.果糖

C.葡萄糖

D.糖精

答案

参考答案：D

改错题
短文改错。
     此题要求改正所给短文中的错误，对标有题号的每一行做出判断：
     如有错误（每行只有一个错误），则按下列情况改正：
     此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线划掉。
     此行缺一个词：在缺词处加一个漏字符号(^)，在该行右边横线上写出该加的词。
     此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。
When train fairs went up for the third times in one year, I de cided
buy a motorcycle to ride to work. My idea was that although I
would have to pay for tax, insurance and gasoline, I will still spend 
more than on train tickets over the year. I might even save time on 
the journey from home to work. So I bought for one small 
second-hand Japanese motorcycle. I began to learn to ride them. At first 
it seemed very difficult for me when I had never learned to ride 
a ordinary bicycle before. But I soon got used to it. I just fell 
off once and twice during the first few weeks, but after a while 
I felt reasonable confident and rode to work every day. 		1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____                                  
10. _____
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单项选择题

经转氨基作用生成草酰乙酸的氨基酸是（）

A．丙氨酸

B．谷氨酸

C．苏氨酸

D．脯氨酸

E．天冬氨酸
查看答案