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【单选题】
超声波在以下哪种介质中的传播速度最快。( )A.
液体
B.
固体
C.
气体
D.
真空
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【单选题】They also noted that herbicides resistance in this weed appears to be on the ________ of becoming an unmanageable problem in soybean.
A.
target
B.
threshold
C.
bottom
D.
list
【单选题】She aimed _______a good doctor in life. [ ]
A.
at becoming
B.
for becoming
C.
in becoming
D.
becoming
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【简答题】会计科目建立的顺序是（ ）。
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