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【单选题】
— You look scared. What happened? — Well , I _______ along the street ________ the UFO landed.A.
was walking ; while
B.
is walking ; when
C.
was walking ; when
D.
is walking ; while
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反馈参考答案：
举一反三
【简答题】狭义的遥感指的是()遥感。
【简答题】输出一个字典中所有的唯一值 (unique value)
【单选题】This party is quit formal so you'd better not wear _________ clothes. [ ]
A.
appropriate
B.
random
C.
typical
D.
casual
【单选题】You’d better an orange coat when you take part in the exam. It may .
A.
in; cheer you up
B.
wear; cheer you up
C.
put on; cheer you up
D.
dress; cheer up you
【单选题】You’d better wear a pair of comfortable trainers when ________a long walk.
A.
you take
B.
taking
C.
to take
D.
A&B
【简答题】865 根据“偶数法则”保留 4 位有效数字为多少? (有效数字)
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