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【单选题】
X、Y、Z、W为四种短周期元素．X元素的原子最外层电子数是核外电子层数的3倍；Y元素的最高正价与最低负价的代数和为6；Z在地球中的含量仅次于氧；Y、Z、W同周期，W的常见化合价为+2价．下列说法不正确的是（ ）A.
存放W单质的仓库失火不能用CO 2 灭火
B.
Z的氧化物熔化时破坏分子间作用力
C.
原子半径由到小的顺序为W＞Z＞Y＞X
D.
与X同主族元素的氢化物中，X的氢化物沸点最高
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举一反三
【单选题】听力原文：W: When are you going to have your eyes checked? M: I had to cancel my appointment. I couldn't fit it in. Q: What docs the man mean? (18)
A.
He decided not to Cancel his appointment.
B.
His new glasses aren't comfortable.
C.
He's too busy to get a checkup.
D.
He has to check when the appointment is.
【单选题】You had one of your teeth pulled out yesterday, ______?
A.
had you
B.
hadn’t you
C.
did you
D.
didn’t you
【单选题】听力原文：W: When are you going to have your eyes checked? M: I had to cancel my appointment, I Couldn't fit it in. Q: What does the man mean? (18)
A.
He decided not to cancel his appointment
B.
His new glasses aren't comfortable.
C.
He's too busy to get a checkup.
D.
He has to check when the appointment is.
【单选题】听力原文：W: When are you going to have your eyes checked? M: I had to cancel my appointment. I couldn't fit it in. Q: What does the man mean? (17)
A.
He decided not to cancel her appointment.
B.
His new glasses aren't comfortable.
C.
He's too busy to get a checkup.
D.
He has to check when the appointment is.
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