规格8.48*0.185*29*23*60*4*R的内螺纹芯头，23代表什么含义：（)

A.芯头实际外径8.48mm

B.芯头名义外径8.48mm

C.管坯内径8.48mm

D.铜管外径8.48mm

A.28/45

B.117/191

C.31/47

D.122/199

A.117/191

B. 122/199

C. 28/45

D. 31/47

A.18～20℃

B.21～23℃

C.24～26℃

D.27～28℃

E.29～30℃

speaking, the choice of words is【21】the utmost importance. Proper selection will eliminate one source of【22】breakdown in the communication cycle. Too often, careless use of words【23】a meeting of the minds of the speaker and listener. The words used by the speaker may【24】unfavorable reactions in the listener【25】interfere with his comprehension; hence, the transmission-reception system breaks down.

【26】, inaccurate or indefinite words may make【27】difficult for the listener. to understand the.【28】which is being transmitted to him. The speaker who does not have specific words in his working vocabulary may be【29】to explain or describe in a【30】that can be understood by his listeners.

(41)

A．of

B．at

C．for

D．on

re different【22】ours, but nowadays【23】seems to enjoy【24】fat girls. That is why many companies have developed special foods to help people to slim. The only thing【25】is wrong with this is what a friend【26】said to me the other day: "I don't mind【27】these foods if they'll give me a good figure, but why.【28】to taste so awful？" The reason is【29】the food makers have to add a lot of vitamins to these foods to satisfy the law, so the only wise advice I could give my friend was "Eat normal food, but【30】less."

(36)

A．tastes

B．steps

C．stages

D．tests

even how we feel. Geographers, however, are【23】interested in climate than in weather. Climate is the pattern of all the weather conditions over a long period of time. Generally【24】, climate【25】to these normal weather conditions, not【26】daily or yearly changes.

Climate, like weather, changes【27】time. It is true【28】these changes【29】a long time, but not as long as we might expect. Records show that over the centuries large portions of the earth have experienced great changes【30】climate.

(36)

A．effects

B．defects

C．infects

D．affects

2】towards the house.

"That【23】a thief !" he thought, and he took his gun and shot【24】him. Then he went back to bed,【25】he was too frightened【26】of the house in the dark.

The next morning John went out and saw one【27】his white shirts hanging【28】the clothes line in the garden. His wife【29】washed it the day before and【30】it out to dry. Now it had a bullet hole right through the middle of it.

"My God," said John, "I was lucky last night. If I had been wearing that shirt, the bullet would have killed me!"

(46)

A．at

B．in

C．above

D．of

oung people are to have. The teenager often wants to be【21】to choose his own friends, select his own courses in school, plan for his own vocational【22】, and earn and spend his own money, and generally【23】his own life in a more independent fashion than .many parents are able to【24】.

Most problems between teenagers and their parents yield best to (导致) joint planning and decision making. Within any particular family【25】are avoided and problems are solved when all of the persons take【26】in the situation,【27】in working it out.【28】parents and young people learn how to get【29】well with each other and develop skills in understanding and【30】understood, even the most difficult problems are relieved.

(36)

A．free

B．likely

C．able

D．curious