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【单选题】
某次军事演习中，一架无人机停在空中对三个地面目标点进行侦察。已知三个目标点在地面上的连线为直角三角形，两个点之间的最远距离为600米。问无人机与三个点同时保持500米距离时，其飞行高度为多少米？（）A.
500
B.
600
C.
300
D.
400
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【单选题】What does the word 'synaesthesia' refers to?
A.
It means that people may appreciate two kinds of beauty at the same time.
B.
It means that people may enjoy beauty with all senses at the same time.
C.
It holds that different spheres of senses may overlap.
D.
It is thoroughly studied by modem science.
【单选题】People can live for many days without food, but two or three days without water may ___ death
A.
result in
B.
result from
C.
carry away
D.
take away
【单选题】已知str_1 = '12345678dfggrytergrg',想获取最后3个元素,以下正确的是()。
A.
str_1[-3:]
B.
str_1[-4:]
C.
str_1[18:20]
D.
str_1[17:20]
【单选题】______ people went to the concert that was held in Reming Square _____ the night of May 25.
A.
Two thousands, on
B.
Many thousand, in
C.
Thousands of, on
D.
Several thousands of, in
【单选题】Attackers in China’s Xinjiang region crashed two cars into shoppers at a market in May, 31 people.
A.
killed
B.
to kill
C.
killing
D.
being killed
【简答题】You may meet many people in your life. But Mom and Dad are two of the most important people in your life. Over your lifetime, they may influence(影响) you more than anyone else you will meet. Moms and D...
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