不安抗辩权是指按照合同规定（）享有的中止履行义务的权利。 A.先履行义务方 B.后履

保险制度存在，必须具备()要素

A.可保危险的存在

B.保险机构

C.多个经济单位的结合

D.随机事件的科学化

阅读理解

     Everyone who has eaten instant noodles (方便面) before knows how it looks like. It is very easy to

cook it instantly by putting the noodles into the boiling water and add in those MSG(味精) packets(小包), together with your other food like eggs or vegetables. However, have you ever wondered whether this is

the correct way of cooking it? When you first took out the noodles from the packaging, you will notice that the noodles are joined together nicely as a piece. In order to make the noodles joined together nicely side by side it needs some form of wax coating (石蜡涂层) in order to show an attractive instant noodles in

front of us. Many people who enjoy eating instant noodles frequently do not really think too much of it as it seems very normal to everyone to have it nicely shown in front of us. However, researches have shown

that the layer (层) of wax coating on the noodles is quite harmful to our body and we should not eat it too

frequently. It is advisable to have a break of 2-3 days before we start to eat another packet of instant

noodles as our body need about 3 days to clear that layer of wax coating away from our body system. Do you know the danger of having too much wax coating stored in our stomach? It will lead to CANCER if it

is stored in our body system for a long period of time.

     There are 2 key points to take note while preparing instant noodles:

     1) Wash the instant noodles with warm water first, stir(搅和) it and pour away the water containing the wax coating.

     2) Repeat Step 1 and try to stir the noodles again to wash away the wax coating on the noodles before cooking it in a new pot of water.

     Hope this article will let more people have self-awareness of the hidden danger of instant noodles and

thus eat safely and stay healthy.

1. The purpose of the writer is to tell us ______.

A. how the instant noodles are made

B. how to cook instant noodles

C. something about the layer of wax coating on the noodles

D. how to eat instant noodles safely and healthily

2. It is true according to the passage that ______. 

A. the instant noodles are joined together in a mess as a piece.

B. it is common to see the noodles nicely joined together.

C. you can eat instant noodles as often as you like.

D. too much wax coating does no harm to our health.

3. Many people don't care about too much of the wax coating on the instant noodles because _____. 

A. they enjoy the taste of the wax coating

B. they take the wax coating for granted 

C. they don't know the hidden danger at all

D. their body clear it faster than other people

4. The function of the wax coating in the instant noodles is to ______. 

A. make the noodles more delicious and tasty

B. make it easier to cook for the consumers

C. make the instant noodles healthier and more attractive to the consumers

D. make the noodles joined in a piece and avoid them sticking (粘) together

硬膜外穿刺操作中不正确的是（）

A.穿刺方法分为直入法和侧入法

B.判断穿刺针进入硬膜外腔的方法主要有阻力骤减和负压现象

C.硬膜外腔负压以腰部最明显

D.导管置入硬膜外腔的长度以3～5cm为宜

E.根据手术部位选择穿刺点

施工项目成本决策与计划的依据是（）。

A.施工成本核算

B.施工成本分析

C.施工成本预测

D.施工成本控制

群体规范具有哪些基本作用？