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【单选题】
老汉家住在( )。A.
山顶
B.
山腰
C.
山脚
D.
山洞里
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举一反三
【单选题】What was Shakespeare's first original play written in about 1590?
A.
Hamlet.
B.
The Merchant of Venice.
C.
King Henry VI.
D.
King Lear.
【简答题】用氟离子选择电极的标准曲线法测定试液中F-浓度时，对较复杂的试液需要加入（）试剂，其目的有第一（）；第二（）；第三（）。
【单选题】______ of this Deratting Exemption Certificate is hereby extended until 4th Oct．2008 as the vessel is laden with cargo．
A.
Validity
B.
Valid
C.
Validation
D.
The coming into force
【简答题】用氟离子选择电极的标准曲线法测定试液中F- 浓度时,对较复杂的试液需要加入( )试剂,其目的( )、( )、( )
【简答题】用氟离子选择电极的标准曲线法测定试液中F-浓度时, 对较复杂的试液需要加入______试剂, 其目的有第一维持试样与标准试液有恒定的离子活度;第二使试液在离子选择电极适合的pH范围内，避免H+或OH-干扰;第三使被测离子释放成为可检测的游离离子。
【单选题】The underlined sentence 'Both students hang on until about mid-term' (Para. 1) tells us that______.
A.
they didn't study well
B.
they didn't take part in class activities
C.
they didn't take notes in class
D.
they didn't finish their study that term
【简答题】[A] until [B] about [C] while [D] as
【单选题】______ of this Deratting Exemption Certificate is hereby extended until 4th Oct．2007 as the vessel is laden with cargo．
A.
Validity
B.
Valid
C.
Validation
D.
The coming into force
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