21. It is natural for students to be attracted to methods that will teach them as quickly and _______ and cheaply as possible.
A: fast
B: easily
C: efficiently
D: effectively
A: fast
B: easily
C: efficiently
D: effectively
举一反三
- Students are eager to find methods that will teach them quickly and efficiently and cheaply。（ ）
- Students are eager to find methods that will teach them quickly and efficiently and cheaply. A: 对 B: 错
- Students in Group A are able to work hard and ( ). A: achieve B: effectively C: process D: efficiently
- Please arrange inspection on our goods as soon as （） A: quickly B: early C: possible D: fast
- In Egypt， to the business cards， which statements of the following are right？（ ） A: Business cards are the must-have accessory. B: They can be printed quickly and cheaply in Egypt. C: It is considered a nice touch to have them printed in both English and Arabic. D: They are exchanged on every possible occasion.