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【单选题】
氢氧化钠溶液和氨水都能使酚酞溶液变红,其原因是二者的溶液中均含有一种相同粒子( )A.
H＋
B.
OH－
C.
H2O
D.
H
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反馈参考答案：
举一反三
【单选题】“_____Emma’s home? Isn’t she feeling well?'“She’s still in bed with a fever.”
A.
How come
B.
What about
C.
When
D.
Where
【单选题】以下关于电源的电动势的说法不正确的是( )
A.
为了定量的描述电源转化能量本领的大小引入电源的电动势这个物理量.
B.
电源的电动势等于把单位正电荷从负极板经内电路搬至正极板的过程中电源非静电力做的功.
C.
电源电动势的方向由负极板经内电路指向正极板，所以电源的电动势是矢量.
D.
电动势是一个标量，它反映电源中非静电力作功的本领.
【单选题】With all her faults, she’s still the best teacher we’ve ever had.
A.
As
B.
Though
C.
Despite
D.
Even though
【单选题】She’s only six, but she’s still old enough to know better than ________ into the traffic. ( )
A.
to run out
B.
running out
C.
her running out
D.
run out
【单选题】______ her illness, she’s still preparing for the following examinations.
A.
Although
B.
Though
C.
In spite
D.
Despite
【单选题】She’s still ( ) work.I’ll ask her to call you when she gets home.
A.
on
B.
at
C.
in
D.
to
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