A new government led by Alexander Kerensky ______.
A.was supported by the Bolsheviks all the time
B.was overthrew by the Bolsheviks
C.abdicated
D.wanted more change
The reason for the government's expansion program working not so well is______
A.because the farmers were uncertain about the financial support the government guaranteed
B.because the farmers were uncertain about the benefits of expanding production
C.because the farmers were uncertain whether foreign markets could be found for their produce
D.because the older generation of farmers were strongly against the program
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
It can be inferred from the second paragraph that______.
A.society is not satisfied with the present college education
B.interference from the government is unwelcome
C.teachers are forced to do what they don't like to do
D.it' s a mistake for universities to teach courses of no commercial use
Passage Two
How can a single postage stamp be worth $ 16,800?
Any mistake made in the printing of a stamp raises its value to stamp collectors. A mistake on one in expensive' postage stamp has made the stamp worth a million and a half times its original value.
The mistake was made more than a hundred years ago in the British colony of Mauritius, a small is land in the Indian Ocean. In 1847 an order for stamps was sent to a London printer, and Mauritius was to become the fourth country in the world to issue stamps.
Before the order was filled and delivered, a ball (舞会) was planned at Mauritius' Government House, and stamps were needed to send out the invitations. A local printer was instructed to copy the de sign for the stamps. He accidentally inscribed the words "Post Office" instead of "Post Paid" on the sever al hundred stamps that he printed.
Today there are only twenty-six of these misprinted stamps left--fourteen "One Penny Orange-Reds" and twelve "Two Penny Blues". Because of the Two Penny Blue's rareness (罕见) and age, collectors have paid as much as $ 16,800 for it.
36. A postage stamp's value to collectors is raised if ______.
A. there are few others like it
B. there are no errors on the stamps
C. a mistake is made in the ,printing
D. both A and C
A.B细胞为Th细胞提供第一信号
B.细胞为Th细胞提供第二信号
C.Th细胞为B细胞提供第一信号
D.Th细胞为B细胞提供第二信号
E.Th细胞分泌细胞因子作用于B细胞