7. The shop could exchange the product if the customer
A. makes no more complaints.
B. can provide the receipt.
C. is still unhappy with it.
D. brings it back within a week.
查看答案
Conversation 38. Joe Smith telephoned Victoria for_______.
A. the menu.
B. the place.
C. the reception.
D. the campaign.
9. When will the lunch be held?
A. Friday next week.
B. Thursday next week.
C. April 30th.
D. This week.
10. All the following information is new to Victoria EXCEPT______.
A. how many people to attend it.
B. why to hold it.
C. where to hold it.
D. what to cook.
函数在某点处极限存在的充要条件是
A. 左右极限存在
B. 左右极限存在且相等
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