皮皮学，免费搜题
登录
搜题
【单选题】
一宇航员要到离地球为 5 光年的星球去旅行。如果宇航员希望把这路程缩短为 3 光年,则他 所乘的火箭相对于地球的速度A.
v=(1/2)c
B.
v=(4/5)cv=(3/5)c
C.
v=(4/5)c
D.
v=(9/10)c
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】But what you saw was _____ not what you got.
A.
quickly
B.
easily
C.
roughly
D.
decidedly
【简答题】My parents used to tell me how important school was for me, but I didn’t think so. I paid little attention to it. But one thing let me finally 1 what my parents meant. One day, when I 2 a mobile phone...
【单选题】Let's imagine that at work, one of your friends saw that someone else was stealing some supplies from the office and your friend says to you: "Should I tell my boss? I don't want to tattle.But I don't...
A.
Well, you know what they say about actions.
B.
Well, you now what they say about honesty.
C.
No news is good news.
D.
Better late than never.
【单选题】But what you saw was_________ not what you got .
A.
burdensomely
B.
airborne
C.
densely
D.
decidedly
【简答题】My parents used to tell me how important school was for me, but I didn’t think so. I paid little attention to it. But one thing let me finally 1 what my parents meant. One day, when I 2 a mobile phone...
相关题目：