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【单选题】
下列有关物质性质的描述不符合事实的是（ ）A.
金刚石是自然界最硬的物质
B.
钠和钾的合金可做原子反应堆的导热剂
C.
有机物不导电
D.
过氧化钠可以作供氧剂
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【单选题】What is NOT stated about the membership?
A.
The membership fee should be paid.
B.
It can be used at the Sunset Beach Hotel.
C.
It is valid for one year.
D.
It can be used with other promotional offers.
【单选题】please send us samples ( )for our reference
A.
airmail
B.
by airmail
C.
airmailing
D.
by airmailing
【单选题】For more information, please send an e-mail, ____ you can also include your advice to us.
A.
when
B.
where
C.
which
D.
that
【简答题】节奏听写7 输入代号,字母小写,连续输入,不要空格。
【简答题】If
you want to apply for membership, click ______.A. Try it free for three months B. Learn more about membership
【单选题】If you want to apply for membership, click ______.
A.
Try it free for three months
B.
Learn more about membership
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