The average elevation of West Virginia is about 1,500 foot above sea level.()
A. average
B. elevation
C. foot
D. sea
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In a microwave oven, radiation penetrates food and is then absorbed primarily by water molecules, caused heat to spread through the food.()
A. food
B. primarily
C. caused
D. the food
Physicians working in the field of public health are mainly concerned with the environmental causes of ill and how to eliminate them.()
A. working
B. concerned with
C. ill
D. how to
我国城镇、街道举办的托儿所、幼儿园的开办费、添置大型设备及房屋维修等开支,由()在自筹经费中酌情补贴。