The author is inclined to think that a fifth level ______.
A.would be little better than the fourth level
B.may be a lot more desirable than the first level
C.can be the last and most satisfying level
D.will become attainable if the government takes action
Some economists believe women earn less than men partly because ______.
A.there are more than enough women in the labor force
B.women have more freedom in selecting jobs
C.women are only provided with low-paid jobs
D.women are less experienced than men
What did the science professors learn after the experiment?
A.They should change the way they teach.
B.A poem could be explained in clear definitions.
C.A poetry class could be more informative.
D.Their teaching was an enjoyable experienc
Laser-doppler radar is especially valuable in space missions because ______.
A.it is one thousand times more precise than microwave radar
B.it provides precise measures of the velocity of space vehicles
C.it is a new system of radar
D.it can measure the movement of a spaceship less accurately than a microwave radar
A+5.0%,+5.0%;
B+5.0%,+0.39%;
C+0.39%,+0.39%;
D不好求出