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【单选题】
下列有关物质性质的比较正确的为 ( ) ①同主族的单质从上到下，非金属性减弱，熔点增高 ②的最高正化合价在数值上等于它所在的族序数 ③同周期主族的原子半径越小，越难失去电子 ④的非金属性越强，它的气态氢化物水溶液的酸性越强 ⑤还原性：S 2 － >Cl － >Br － ⑥酸性：HClO 4 >H 2 SO 4 >H 3 PO 4 >H 2 SiO 3A.
①③
B.
②④
C.
③⑥
D.
⑤⑥
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举一反三
【单选题】He raised his voice to make everybody in the room him clearly. [ ]
A.
heard
B.
hear
C.
to hear
D.
hearing
【单选题】To make oneself fit for the job, __________.
A.
it is necessary to be trained in that school
B.
a special trained worker is needed
C.
we should all go to the training school
D.
one needs to be trained in that school
【多选题】在PowerPoint的幻灯片放映视图放映演示文稿过程中，要结束放映，可以采用（）方法。
A.
按“Esc”键
B.
按“Ctrl+E”
C.
按回车键
D.
单击鼠标右键，从快捷菜单中选择“结束放映”
【简答题】make oneself at home
【简答题】make oneself heard
【单选题】_______ himself ______ clearly, he raised his voice.
A.
So as to make; heard
B.
In order to make; hear
C.
To make; heard
D.
In order that make; hear
【简答题】由一种类型细胞构成的组织称为_______组织，由多种类型细胞构成的组织称为_______组织。
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