“PPD”试验阳性表明机体
A. 细胞免疫功能正常
B. 体液免疫功能正常
C. 细胞免疫功能缺乏
D. 体液免疫功能缺乏
E. 以上都不是
Techniques for ________ sleep would involve learning to control both mind and body so that sleep can occur.
A. promoting
B. strengthening
C. cultivating
D. simulating
Residents were cutting their lawns, washing their cars and otherwise ________ a pleasant, sunny day.
A. idling away
B. wasting away
C. chasing away
D. driving away
We’d like to ________ a table for five for dinner this evening.
A. preserve
B. conserve
C. reserve
D. deserve