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【单选题】
法司法,若用荧光指示剂时,最适宜pH为 ( ),酸度太高,指示剂不被吸附,碱性太强,Ag + 形成Ag 2 O↓ 干扰滴定。A.
7～10
B.
4～6
C.
7
D.
5～7
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【单选题】下列有关生物安全柜的实验操作中，不正确的是（）
A.
手臂应缓慢移动，避免影响正常的气流
B.
尽量避免将离心机、漩涡振荡器等仪器安装在柜内
C.
柜内尽量不要使用明火
D.
处理不同标本时，因柜内有垂直洁净气流，故不用担心标本之间相互污染
E.
在柜内摆放物品时，应尽量呈一字横向摆开
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【单选题】Our teacher _________ a report this afternoon. Don’t miss it.
A.
gives
B.
was given
C.
is giving
D.
has given
【单选题】Mother gave Alice 30 dollars. She spends a fifth of the 30 dollars on books, a quarter of the remainder at a hairdresser's and buys a new skirt for 10 dollars. How many dollars does she have now? ()
A.
15
B.
8
C.
16
D.
9
【单选题】----How many new words are there in ________ lesson? ----There are only _________.
A.
five; fifth
B.
fifth; five
C.
the fifth; the five
D.
the fifth; five
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