问题 单项选择题

霉变甘蔗中分离的毒素为()

A.黄曲霉素

B.赭曲霉素

C.伏马菌素

D.3-硝基丙酸

E.青霉素

答案

参考答案:D

解析:甘蔗节菱孢霉产生的3-硝基丙酸(3-NPA),是一种强烈的嗜神经毒素,主要损害中枢神经系统。

阅读理解

阅读理解。

     A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you are lazy

for most of the year and then work hard only a few days before the exam. If you want to be good at English,

you have to read stories in English, and to speak English as much as possible. A few days before the exam you

should go to bed early. Do not go to bed late at night studying. Before you start answering in the exam, read

carefully over the question papers, and try to understand the meaning of each question. When you have finished

your exam, read over your answers. Correct the mistakes if there are any and be sure that you don't miss

anything out.

1. If people want to do well in an exam, they have to work hard ______. [ ]

A. every day in a year

B. for most of the month

C. for only a few days

D. late at night

2. If people want to learn English well, they ______. [ ]

A. only need to learn grammar

B. must often practice English

C. have to go to England

D. should go to bed early

3. It is important to ______ a few days before the exam. [ ]

A. play too much

B. have a good sleep

C. read the question papers

D. have a good drink

4. When people have finished the exam, they should ______. [ ]

A. stand up and leave at once

B. answer a few more questions

C. make sure that they don't miss anything out

D. leave some mistakes on the question paper

5. The best title for the passage is ______. [ ]

A. An Important Exam

B. An Easy Exam

C. Get Ready For Exams

D. How to Pass an Exam

判断题