问题 单项选择题 A1型题

下列有关时间分辨荧光免疫分析的描述正确的是()。

A.标记技术与放射免疫分析不同,属于分子标记

B.测量易受到荧光本底高的影响

C.镧系元素发射的荧光容易发生淬灭

D.镧系离子与螯合剂结合后,荧光信号寿命增加

E.镧系荧光光谱的激发峰和发射峰有较小的峰移

答案

参考答案:D

阅读理解

根据短文判断下列句子的正确(T)与错误(F)。

     Being safe at school and in your everyday life needs knowledge. If you remember the following information, your life will be much safer.

     ●Always notice the environment around you. You shouldn't walk alone outside. Make sure where the public

phones are. If anything dangerous happens, you can find them quickly.

     ●Don't use earphones (耳机) when running in the schoolyard or on the street. You will keep yourself from

the outside world and can be easily surprised.

     ●School bags should be carried towards the front of your body instead of putting them on your back. When buses are crowded, it is easy enough for thieves to steal the things in your bags on your back.

     ●If you are followed by a stranger, cross the street and go in the other direction (方向), let the stranger

know that you know he or she is there. Next, go and get help from others if it is necessary. Don't go home

directly. You are safer on the street than you are in your home or in a lift.

     ●If you have to take a bus to a place far away, try to get to the stop a few minutes before the buses leave.

This prevents a stranger from studying you. On buses, don't sit alone, sit behind the driver or with you friends. Don't sleep.

     ●Don't play with matches (火柴) or candles, because it may cause fire. If your house catches fire and you have to escape through smoke, move on your hands and knees with your head 30 to 60 centimetres (厘米)

above the floor. Please remember there is cleaner, cooler air near the floor during the fire.

( )1. If you find a stranger following you, go home right away.

( )2. You'd better sit after the driver when you are alone to take a bus.

( )3. It's good for you to use earphones when you are running outside. 

( )4. You shouldn't sleep all the way although it's a long bus trip.

( )5. During the fire, the cleaner and cooler air is far from the floor.

( )6. When you escape from the house on fire, you should move on your

          hands and knees with your head 300 to 600 centimetres above the floor.

单项选择题