How many circles contain a black dot？
A. 12.
B. 13
C. 14
D. 15
Lead time is an important concept of a person's culture that is ______.
A. learned casually and without planning
B. vague because its rules have not been stated technically
C. not taught formally in the classroom
D. only learned through experience
According to the passage, consumerist culture ______.
A. cannot thrive on a fragile economy
B. will not aggravate environmental problems
C. cannot satisfy human spiritual need
D. will not alleviate poverty in wealthy countries
For an American, having to wait 15 minutes for an interview is ______.
A. annoying
B. frustrating
C. tolerable
D. unacceptable
微信支付 
支付宝支付