砷为VA族元素，推测其不可能具有的性质是
A．砷在常况下是固体
B．砷可以有-3，+3，+5价</PGN0024B.TXT/PGN>
C．As2O5对应的水化物的酸性比H3PO4强
D．砷不能与空气反应
相关试题
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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