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【单选题】
下列物质中既有离子键又有共价键的是（ ）A.
CaCl 2
B.
H 2 O
C.
K 2 O
D.
NaOH
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举一反三
【单选题】The word 'bead' originally meant prayer, but now it refers to the rosary used in the prayer. This is an example of ______.
A.
widening of meaning
B.
loss of meaning
C.
meaning shift
D.
narrowing of meaning
【单选题】听力原文： (20) To most of us, sharks are the most dangerous fish in the sea and they attack humans. However, according to Doctor Clark, who has studied the behavior. of sharks for twelve years, humans are...
A.
They eat huge amounts of food.
B.
They usually eat twice a day.
C.
They usually eat to their hearts content.
D.
They eat much less than people assume.
【简答题】期间费用包括管理费用、()和销售费用
【单选题】I have two boys but ______ of them likes sweets.
A.
both
B.
either
C.
none
D.
neither
【单选题】The word 'bead' originally means 'prayer', but later it refers to 'the prayer bead', the visible manifestation of a prayer, finally 'small, ball-shaped piece of glass, metal or wood'. This is an examp...
A.
meaning-shift
B.
widening of meaning
C.
narrowing of meaning
D.
loss of meaning
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