甲、乙两数的比是5：4，甲数比乙数多______．

阅读理解。

     If you go into the forest with friends, stay with them. If you don't, you may get lost (迷路) , this is

what you should do. Sit down and stay where you are. Don't try to find your friends let them find you

instead. You can help them find you by staying in one place. There is another way to help your friends or

other people to find you. You can shout or whistle (吹口哨) three times. Stop. Then shout or whistle

three times again. Any signal (信号) given three times is a call for help.

     Keep on shouting or whistling. Always three times together. When people hear you, they will know

that you are not just making a noise for fun. They will let you know that they have heard your signal.

They will give you two shouts or two whistles. When a signal is given twice,  it is an answer to a call for

help.

     If you don't think that you will get help before night comes , try to make a little house with branches

(树枝) . Make yourself a bed with leaves (树叶) and grass.

     When you need some water, you have to leave your little branch house to look for it. Don't just walk

away. Pick off small branches and drop (扔下) them as you walk in order to (为了) go back again easily. When you are lost, the most important thing to do is to stay in one place.

1. If you get lost in the forest, you should _             .

A. try to find your friends

B. stay in one place and give signals

C. walk around the forest

D. shout as Loudly as possible

2. Which signal is a call for help?

A. Shouting here and there.

B. Crying twice.

C. Shouting or whistling three times together.

D. Whistling everywhere in the forest.

3. When you hear two shouts or two whistles, you know that               .

A. someone is afraid of an animal

B. people will come to help you

C. someone needs help

D. something terrible will happen

4. What's the meaning of the underlined sentence?

A. Leave branches to find your way back.

B. Pick off  branches to build another house.

C. Use branches to make a bed.

D. Drop branches to look for water.

5. The main (主要的) idea of the passage is _______．

A. how to travel in the forest

B. how to spend the night in the forest

C. what you should do if you want to get some water

D what you should do if you are lost in the forest

我国政府对国外援助物资可不经检验检疫机构实施检验，直接启运出境。 ( )

从事预防、诊断、治疗疾病活动并使用药品的医疗机构、卫生防疫防治机构和保健机构是

A．严重、罕见的药品不良反应
B．药品不良反应
C．监测统计资料
D．可疑不良反应
E．禁忌证

下列参数中，（）不是描述光纤通道传输性能的指标参数。

A.光缆衰减

B.光缆波长

C.回波损耗

D.光缆芯数

在气象上，大气垂直分层的主要依据是（）.

A.对流运动情况

B.气温的垂直分布情况

C.水汽和云层的垂直分布情况