皮皮学，免费搜题
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【单选题】
熔融 SiO 2 晶体时,需要克服的作用力主要是A.
离子键
B.
氢键
C.
共价键
D.
范德华力
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The old house is enclosed by trees.
A.
protected
B.
prevented
C.
disclosed
D.
surrounded
【单选题】The old house is enclosed with trees
A.
protected
B.
prevented
C.
covered
D.
surrounded
【简答题】The old house is now in ____ possession of the government.
【单选题】The old house is regarded as a part of local history, so it should be _____. [ ]
A.
preserved
B.
defeated
C.
sheltered
D.
deserved
【单选题】The old house is _____ with trees.
A.
protected
B.
prevented
C.
covered
D.
surrounded
【单选题】The old house is in perfect conditions because it has recently been renovated .
A.
restored
B.
damaged
C.
destroyed
D.
decayed
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