What is the most important factor for a rocket to escape from the Earth? [br] Wh

游客2023-10-06 50

问题 What is the most important factor for a rocket to escape from the Earth? [br] Why is it not necessary to provide powered flight in space all the time?

选项 A、Few spacecrafts complete their flight operations.
B、The Earth’s gravity cannot be overcome.
C、No further power is needed after the escape speed is reached.
D、Free fall takes the place of the Earth’s gravity pull.

答案 C

解析从文章第三段第一句“一旦火箭达到了脱离地心引力的速度，就不再需要更多的能量”，可以判断出此题的答案应为C。

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What is the most important factor for a rocket to escape from the Earth? [br] Wh

Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]

Heescapedfromthebattlefieldonly______bythelocalpeople.A、killedB、toki

Whathesays(be)______notimportant.is他说的话并不重要。题中what引导了一个主语从句，后面接单数动词作谓语。

Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapers

Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapersonw

Thepurposeofthispassageismainlytotellus______.[br]Themostimportant

Thepurposeofthispassageismainlytotellus______.[br]Themostimportant

Wehadaroadaccidentlastweekend,butwewere(luck)______toescapeinjury.

Ourfamily(be)______discussinganimportantmatter.are我们全家人正在讨论一个重要的问题。family

Thepolicecaughthim______overthewallofthefactory.A、climbingB、climbedC

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