He built a pair of wings of a size suitable to _______ his own weight, and made use of gravity as his motor.
A: entertain
B: retain
C: obtain
D: sustain
A: entertain
B: retain
C: obtain
D: sustain
举一反三
- 中国大学MOOC: He built a pair of wings of a size suitable to _______ his own weight, and made use of gravity as his motor.
- More poles are needed to ______ the weight of the tent. A: retain B: B. sustain C: C. maintain D: obtain
- He made it a ___ to bulid a successful business on his own in his district.
- He built up the business at the ______ (expensive) of his own health.
- – Will Eddie use his brother’s bicycle? --- No, he wants one _______. A: for him B: of his own C: his alone D: only of himself