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【单选题】
砷化合物分为有机砷化合物和无机砷化合物，有机砷化合物毒性比无机砷化合物毒性A.
高
B.
低
C.
相同
D.
≥100倍
E.
≥50倍
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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A.
call
B.
calls
C.
called
D.
calling
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【单选题】Now many people like chatting _____ their friends _____ the Internet. [ ]
A.
to, in
B.
to, on
C.
with, in
D.
with, on
【单选题】已知下列化学键的键能(kJ/mol): C-C 346; C=C 610; H-H 436; C-H 413. 则反应:CH 2 =CH 2 +H 2 →CH 3 CH 3 的反应热为: [ ]
A.
126 kJ
B.
+126 kJ/mol
C.
-126 kJ/mol
D.
126 kJ/mol
相关题目：
【单选题】Now many people like to play a game ___________“QQ Farm”.
A.
call
B.
calls
C.
called
D.
calling