单项选择题

Many pure metals have little use because they are too soft, rust too easily, or have some other ______.

A．bruises
B．blunders
C．handicaps
D．drawbacks
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单项选择题
Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.
A．homogenous
B．instantaneous
C．spontaneous
D．anonymous
单项选择题
He is a(n) ______ and well-behaved child, but his parents worry about him for he talks too little.
A．obedient
B．transient
C．conscious
D．passionate
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