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【单选题】
以下关于酶活性单位U的说法正确的是A.
在特定的条件下，每分钟能催化1μmol/L底物转变的酶量
B.
在25℃下，每分钟能催化1μmol/L底物转变的酶量
C.
在37℃下，每分钟能催化1μmol/L底物转变的酶量
D.
在25℃下，每分钟能催化1mol/L底物转变的酶量
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皮皮学刷刷变学霸
举一反三
【单选题】It is not (surprised) that Mr. Smith got no help when he (fell ill). He wasn't (on) good terms with anyone in the (neighbourhood).
A.
surprised
B.
fell ill
C.
on
D.
neighbourhood
【单选题】He could have finished it on , but he was ill last week and that was why he fell behind.
A.
schedule
B.
disadvantage
C.
purpose
D.
timetable
【单选题】He was caught in the rain yesterday ______, he fell ill this morning.
A.
on the contrary
B.
in contrast
C.
in other words
D.
as a result
【简答题】V．用所给词的适当形式填空。(10分) 36． This is________ (possible) their worst performance ever．
【单选题】He worked SO hard that eventually he fell ill
A.
then
B.
surely
C.
finally
D.
recently
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