防雷引下线的形式，一是敷设圆钢或扁钢，二是利用[] 。
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避雷网和避雷带宜采用（ ） 和（ ） ，优先采用（ ）
The underlined part in “biochemistry” means_____.
A. life
B. drug
C. two
D. system
Insulin belongs to the group of biomacromolecules called_______.
A. nucleic acids
B. carbohydrates
C. lipids
D. proteins/peptides
Pancreas belongs to_______.
A. both cardiovascular system and digestive system
B. both endocrine system and respiratory system
C. both digestive system and endocrine system
D. both cardiovascular system and endocrine system
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