W: Did you hear the thunder last night
M: Did I It was really loud.
W: I didn’ t see any lightning, though. I thought that thunder and lightning always occur at the same time.
M: They do. It’ s no possible to have one without the other since thunder is a direct result of lightning.
W: Really
M: Yes. Thunder is caused by the rapid expansion and contraction of highly heated air along the path of an electrical discharge.
W: In other words, lightning quickly heats the air and causes thunder. But if the lightning is there, why can’t we see it
M: Because it sometimes occurs very high in the clouds.
W: I wonder if it’ s possible to see the lightning and not to hear the thunder.
M: Yes. It’ s possible if the lightning flashes far enough away. Sound doesn’ t travel as far as light.
The Social Security Act did not include health insurance because the commission considered that its inclusion would jeopardize the passage of the act（）
F: Mr. Mitchell, when we last met, time did not permit us to discuss Sinochem’s exports of agrochemicals. Shall we review these now before we continue our discussions on dyestuffs and organic pigments
M: I think that might be a good idea, Madam Li. Our time in Beijing is growing short and I do wish to take home as much information as I can.
F: This catalogue describes our agrochemicals’ exports, which include insecticides, fungicides, herbicides, and plant growth regulators, as well as fertilizers.
M: We would like to take home a number of copies of this catalogue, if we may, for review by our marketing division. In the meantime, however, it would appear that insecticides would be of primary interest.
F: Certainly, Mr. Mitchell. Just let me know how many copies you want and will have them delivered to your hotel before you leave.
M: Oh, half a dozen will be fine for now.
F: I will make sure this is done. May we now conti
A. 10 metric tons.
B. 12 metric tons.
C. 14 metric tons.
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