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【简答题】
求下列三角函数的不定积分：
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皮皮学刷刷变学霸
举一反三
【单选题】According to the passage, mathematicians present a danger to scientists because ______.
A.
mathematicians may provide theories that are incompatible with those already developed by scientists
B.
mathematicians may define situation in a way that is incomprehensible to scientists
C.
mathematicians may convince scientists that theoretical assumptions are facts
D.
scientists may come to believe that axiomatic statements are untrue
【单选题】—I'm not sure _________there are living things on the planets or not. —Even scientists aren't sure about it. [ ]
A.
whether
B.
where
C.
why
D.
what
【单选题】It is believed by most scientists that______.
A.
the moon was hit by an object as large as Mars
B.
the moon formed from pieces of rock from Mars
C.
the pieces from Mars came together to form. the earth
D.
the moon is made up of materials similar to those of the earth
【单选题】______the bones under the sand，the scientists concluded that they came from the dinosaurs about 65 million years ago．
A.
Being inspected
B.
Inspected
C.
Having inspected
D.
To inspect
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