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【单选题】
有实验证明（）对植物通过光周期极为重要。A.
连续黑暗的时期
B.
连续光照的时间
C.
充足的氧气
D.
适宜的低温
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反馈参考答案：
举一反三
【单选题】I got a new battery for my recorder only last week, but it seems to have ______ already.
A.
worn out
B.
run down
C.
knocked off
D.
gone off
【判断题】Since your competitors have already spent a lot of money in advertising new products ,it would be useless for you to do so .
A.
正确
B.
错误
【单选题】A: How would you like us to pack your products? B: Since there are glasses and fragile items, I think you'd better use _______.
A.
bags
B.
drums
C.
casks
D.
wooden boxes
【单选题】Since I attended the Canton Fair last year, I've been ( ) being here to konw more about your products.
A.
look forward
B.
looking forward to
C.
looked forward
D.
looked forward to
【单选题】Since your products are ____ their superior quality and beautiful design, I want a ____ to have a look.
A.
known for, simple
B.
known that, sample
C.
known about, simple
D.
known for, sample
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