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【单选题】
下列对晶体硅的有关叙述正确的是A.
晶体硅和金刚石的物理性质相似
B.
硅在地壳中含量居第二位，可以以游离态存在于自然界中
C.
晶体硅是一种良好的半导体材料，但它的提炼工艺复杂，价格昂贵
D.
. 晶体硅具有金属光泽，故它属于金属材料，可以导电
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【简答题】U3 Additional Language Quiz There are ten sentences in this section. Beneath each sentence there are four choices or phrases marked A, B, C and D. Choose one word or phrase that best completes the sen...
【单选题】The little chick ______ the earthworm, deciding whether to swallow it or let it go ? [ ]
A.
stared at
B.
glimpsed at
C.
looked into
D.
glared at
【单选题】The little chick ________ the earthworm, deciding whether to swallow it or let it go. [ ]
A.
glimpsed at
B.
looked into
C.
stared at
D.
glared at
【简答题】U4 Additional Language Quiz There are ten sentences in this section. Beneath each sentence there are four choices or phrases marked A, B, C and D. Choose one word or phrase that best completes the sen...
【简答题】The children looked wonderfully (health) ______ with their bright eyes and glowing cheeks.
【单选题】“Mum !” she cried suddenly , tears down her cheeks .
A.
rolling
B.
rolled
C.
to roll
D.
being rolled
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