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【单选题】
某组织培养实验室的愈伤组织被真菌严重污染，为查找朽染原因设计了4个实验，实验条件除图示外其他均相同。下列各图表示实验结果，据图得出结论不正确的是 [ ]A.
污染主要是培养基灭菌时间短造成的
B.
污染主要来源于组织培养所用的离体组织
C.
调节培养基pH不能解决污染问题
D.
调节培养温度不能解决污染问题
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举一反三
【单选题】PayPal and BidPay are special names for ______.
A.
money orders
B.
cashier's checks
C.
personal checks
D.
electronic payment services
【单选题】A hidden alarm under the cashier's can be ______ in case of emergency.
A.
negotiated
B.
initiated
C.
launched
D.
activated
【单选题】According to Neil, people who cut in front of others or run red lights are
A.
aggressive.
B.
understandable.
C.
intolerable.
D.
pathetic.
【单选题】Bob: Yes. Here you are, 20 dollars. Cashier: Thanks. _________. Next one, please.
A.
That’s all
B.
Wait a minute
C.
It’s a good deal
D.
Here’s your change
【简答题】A. run B. ride C. red
【简答题】完形填空 If you wear socks on your ears, you won’t be punished. Crossing a street against a red light is another matter - it’s against the law. Laws are __ 1 ____ rules made by governments. They keep p...
【简答题】cashier's (desk)_____
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