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【单选题】
用酸碱滴定法测定碳酸钙的含量，可采用的方法是A.
直接滴定法
B.
反滴定法
C.
置换滴定法
D.
间接滴定法
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举一反三
【单选题】If you want to catch your flight, you’d better ____ for the airport right now.
A.
cut off
B.
cheer up
C.
set off
D.
settle down
【单选题】You’d better_________ his name, address and telephone number in your notebook before you forget them.
A.
pack up
B.
care about
C.
set up
D.
set down
【单选题】You’d better__________enough time to complete the work that you are normally assigned each week．
A.
set back
B.
set out
C.
set aside
D.
set off
【简答题】Reading for the sake of has no , unless you set yourself a particular period in which to accomplish a reading can be helpful as a way of getting yourself to . You needn’t be too gloomy if you the time...
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