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【单选题】
From what the author says, we can infer that 'Exposure to severe weather causes colds. 'is ______.A.
only a supposition of doctors
B.
still the view held by many people
C.
an out-of-date view of people in the past
D.
a fact already proven by doctors
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【简答题】原则上是选择工艺上允许作为[填空(1)]的变量作为控制量，一般不应选择工艺上的[填空(2)]的变量作为控制量A. 控制手段B. 主要物料或不可控
【单选题】There was a bird ______ in the shy just now. [ ]
A.
fly
B.
flying
C.
to flying
D.
flew