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【单选题】
. 自然条件下,光周期诱导所要求的光照强度是( )。A.
低于光合作用所要求的光照强度
B.
大于光合作用所要求的光照强度
C.
等于光合作用所要求的光照强度
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举一反三
【单选题】My parents advise me in that river. It's dangerous.
A.
swimming
B.
swim
C.
not to swim
D.
not swim
【简答题】That's my (advise) to you.
【单选题】There are two character strings：s and t.s='My favor is computer'，t=substr(s，9，5)．Then the result after operation is
A.
S='My favor is computer'； t='compu'；
B.
S='My favor is computer'； t='is co'；
C.
S='My favor'； t='is co'；
D.
S='My favor'； t='is computer'；
【单选题】When I have some worries, my close friends always advise me ______too much.
A.
don’t worry
B.
not to worry
C.
worry
D.
worrying
【单选题】There are hardly any people on the hill in winter, ______ ? [ ]
A.
are they
B.
aren’t they
C.
aren't there
D.
are there
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