题目内容
听力原文：W: So, Alison. Do you know what you want？
M: I'm not sure. The chicken sounds nice, but so does the fish. What about you？
W: Well, I think I'm going to have the fish.
M: OK. I'll have that, too.
•For Questions 1-8 you will hear eight short recordings.
•For each question, mark one letter (A, B or C) for the correct answer.
•After you have listened once, replay each recording.
What does Alison order？
查看答案
搜索结果不匹配？点我反馈
更多问题
Someday, in【C1】______ the outer planets of our solar system, humankind will want to do【C2】______ send small probes that merely fly rapidly by them. In time, we will want【C3】______ spacecraft that will go【C4】______ orbit around these alien planets, land robots on their moons, and even return rock and soil sample back to Earth.【C5】______ , we will want to send humans to their moons, on at least【C6】______ which liquid water—the fundamental requirementfor life【C7】______ we know it—is believed to be【C8】______ .
For missions such as these, we will need rockets powered by a nuclear reaction【C9】______ igniting chemicals. Chemical rockets have served us well. But the【C10】______ low amount of energy that they can deliver for a given mass of fuel is a severe【C11】______ when dispatching spacecraft【C12】______ long distances. To reach the outer planets, for example, a chemically-powered space vehicle must【C13】______ fuel by having a very small mass and making【C14】______ use of gravity "assists", in which the craft maneuvers close enough to a planet for the planet's gravity to propel the craft forward,【C15】______ its speed.
In technical term, chemical rockets have low【C16】______ velocity growth, which means that their exhaust velocities are not high enough to【C17】______ very high speed to the rocket. Nuclear rockets,【C18】______ their chemical counterparts, could impart a maximum velocity of【C19】______ about 22 kilometers a second. Such a high velocity would make possible a direct path to Saturn (土星), reducing travel time from about seven years to as【C20】______ as three.
【C1】
David Rakison has most probably classified the fear for dangerous animals as a(n) ______.
【C2】
The author holds the view that the apple story is ______.
微信支付 
支付宝支付