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【单选题】
（ ）指直接用于产品生产并构成产品实体或主要成分的原料、主要材料、外购半成品、 有助于产品形成的辅助材料，以及卣接用于产品的各种燃料和动力费用。A.
制造费用
B.
直接材料
C.
成本
D.
管理费用
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举一反三
【单选题】--What were you up to when she dropped in?--I ______ for a while and ______ some reading.
A.
was playing, was going to do
B.
played, did
C.
had played, was going to do
D.
had played, did
【简答题】(选做题)回答下列有关生物技术实践的问题。 (1)某同学设计的提取玫瑰精油的实验流程如图所示： 在②步中使用___________(填“水中'“水上”或“水汽”)蒸馏更简便易行。在操作时向蒸馏烧瓶中加入几片碎瓷片，目的是_____________。 (2)提取精油时，为了使油水分层，要向油水混合物中加入_________，分离的油层还含有少量水，需加入__________，再用过滤法将其除去。 (...
【单选题】—What were you up to when she dropped in?—I ______ for a while and ______ some reading.
A.
was playing, was going to d0
B.
played, did
C.
had played, was going to do
D.
had played, did
【单选题】What does the woman suggest the man to do?
A.
Read some novels in English.
B.
Read some easy articles in English first.
C.
Borrow some articles in English.
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