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【单选题】
极桩上应涂抹( )，以防腐蚀。A.
润滑油
B.
酒精
C.
凡士林
D.
凡士林或润滑油
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举一反三
【单选题】生态系统的基本组成部分是( )。
A.
植物、动物、微生物及其生存环境要素
B.
生物环境要素和非生物环境要素
C.
植物、动物、微生物
D.
生存环境要素、生物环境要素、生活环境要素
【单选题】生态系统的基本组成部分是______。
A.
非生物环境要素、生物环境要素
B.
植物、动物及生存环境要素
C.
非生物环境要素、植物——生产者有机体、动物——消费者有机体、微生物——分解者有机体
D.
非生物环境要素、植物、动物
【单选题】When the sentence "The had made a mess of the house" is turned into passive voice, which of the following is CORRECT?
A.
A mess had been made in the house.
B.
A mess had been made by them.
C.
The house had been made a mess of.
D.
The house had been made a mess.
【单选题】It started raining，so she__________ the nearest house．A.made forB.made off
A.
It started raining，so she__________ the nearest house． A.made for
B.
made off
C.
made up
D.
made out
【单选题】生态系统的基本组成部分是( )。
A.
非生物环境要素、生物环境要素
B.
植物、动物、微生物及其生存环境要素
C.
植物、动物、微生物
D.
非生物环境要素、植物、动物
【单选题】When the sentence "They had made a mess of the house" is turned into passive voice, which of the following is CORRECT?
A.
A mess had been made in the house.
B.
A mess had been made by them.
C.
The house had been made a mess of.
D.
The house had been made a mess.
【单选题】The burglars broke into his house and______before the police arrived.
A.
made for
B.
made off
C.
made out
D.
made up
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