《建筑施工高处作业安全技术规范》（JGJ 80一1991）规定，搭设临边防护栏杆．防护栏杆应包括（）组成。

What does the passage imply about marriage？

A．There is no friendship involved in it.

B．There is usually a special occasion for it.

C．It requires shared experiences and emotions.

D．It is a much closer relationship than friendship.

What does the professor imply about the asteroid impact？

A．It is a widely accepted theory, but not scientifically proven yet.

B．Scientists disagree about the size of the asteroid that hit the planet.

C．It is something which he does not believe in personally.

D．It is less fully researched than other theories.

What does the man imply about the woman's teacher？

A．The professor is very difficult to understand.

B．He does not know where she came from.

C．Her students seem to like her teaching style.

D．He is familiar with her requirements.

What does the professor imply about memorizing information？

A．It is the best strategy for earning high test scores．

B．It is difficult when the information is unfamiliar．

C．It is the only way to make chemistry interesting．

D．It is not the most important part of education．

What does the professor imply about making mistakes？

A．You should try not to make any mistakes.

B．It is dangerous to make mistakes in chemistry．

C．Mistakes can be a part of the learning process．

D．Professional chemists rarely make mistakes．

What does the professor imply about the short life span of the butterfly？

A．They live only to migrate to find food.

B．Butterflies are beautiful to look at.

C．It is not as important as the caterpillar.

D．It is a very important time in its life cycl

What does the professor imply about the effect of increasing imports？

A．It will eventually result in a decrease in exports.

B．It is not necessarily bad for the economy.

C．It creates domestic economic problems that are easily solved.

D．Its impact on the economy is immediately apparent.

What does the professor imply about making mistakes？

A．You should try not to make any mistakes.

B．It is dangerous to make mistakes in chemistry．

C．Mistakes can be a part of the learning process．

D．Professional chemists rarely make mistakes．

What does the professor imply about Roman laws？

A．They were designed to benefit the largest number of people.

B．Only the poor were punished when they broke any of them.

C．They changed each time another country was conquered.

D．It was the job of the military to make sure they were followe

What does the professor imply about the student named May？

A．She should have asked a graduate student to be her tutor.

B．She understood the principals of good management.

C．She allowed events to keep her from reaching her goal.

D．She studied very hard but had unusually bad luck.