短周期元素X、Y、Z的原子序数依次增大，其原子的最外层电子电子数之和为13。X与Y、Z位于相邻周期，Z原子最外层电子数是X原子内层电子数的3倍或者Y原子最外层电子数的3倍；下列说法正确的是 （ ）
| A．X的最高价氧化物对应的水化物显弱酸性 |
| B．X的氢化物的水溶液在空气中存放不易变质 |
| C．Y的氧化物是离子化合物 |
| D．X的氢化物和Z的氢化物反应生成一种对热稳定的化合物 |
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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