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【判断题】
深液流栽培的特点是大部分根系浸没在营养液中,少部分根系裸露在空气中。A.
正确
B.
错误
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反馈参考答案：
举一反三
【判断题】1970年美国超级市场AdHoc委员会制定了通用商品代码——UPC码（Universal Product Code），此后许多团体也提出了各种条码符号方案。
A.
正确
B.
错误
【单选题】— Excuse me. Can you spare me a few minutes? — _____. [ ]
A.
What's on?
B.
What's more?
C.
What's up?
D.
What is it?
【单选题】―Do you have anything to do this afternoon? ―What’s up? ―Let’s go shopping. It’s said that Jinying Shop _____, and all the sweaters are sold at half price. ―Why not?
A.
has closed down
B.
was closing down
C.
closes down
D.
is closing down
【单选题】—Excuse me，can you spare me a few minutes? —________？
A.
What's on
B.
What's up
C.
What is it
D.
What's more
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