C．Love. D．History.

　　答案　B

　　3．The futurologists will hold a seminar，aiming to ________.

　　A．do a research about future

　　B．solve some problems about energy and natural sources

　　C．study the chances of people setting on other planets

　　D．discuss the endless possibilities of the future

　　答案　D

　　4．Why will many people want to attend the seminar?

　　A．Because they are curious about the future.

　　B．Because they want to make friends with futurologists.

　　C．Because they dream of starting new enterprises based on the predictions made by futurologists.

　　D．Because they can make a fortune at the seminar.

　　答案　C

　　5．What is the prediction by the middle of the century?

　　A．A new type of electronic human might have developed.

　　B．No one will die of starvation.

　　C．Garments will be so strong that they will never get old and worn.

　　D．Tiny，insect－like robots may be sent around the cells of our bodies.

　　答案　A

　　1．mass n．质量；团，块；大量

　　(1)n.质量

　　①How to calculate the mass of a planet?

　　如何计算一个行星的质量？

(2)n.团，块，堆；大量