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【判断题】
糖在植物组织培养中是不可缺少的,它不但作为离体组织赖以生长的碳源,而且还能使培养基维持一定的渗透压(一般在1.5~4.1MPa。一般多用蔗糖,其浓度为1%~5%,也可用砂糖、葡萄糖或果糖等。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】毛泽东思想的历史地位包括哪些?
A.
马克思主义中国化第一次历史性飞跃的理论成果
B.
中国革命和建设的科学指南
C.
党和人民的宝贵精神财富
D.
马克思主义中国化第二次历史性飞跃的理论成果
【简答题】Once a great boxer(拳击手),Tom Black, went to a restaurant for supper. He took off his coat and left it at the door, but he was afraid that somebody would take it away. So he took out a piece of paper an...
【单选题】As soon as the man walked into the room ~ he ______ his heavy coat and sat down.
A.
took away
B.
took down
C.
took off
D.
took up
【单选题】如图所示,平行四边形 ABCD ,点 E 在边 AB 上,且 ,点 F 为对角线 BD 上的点,且 ,则 ( )
A.
E,F,C三点共线，且
B.
E,F,C三点共线，且
C.
E,F,C三点共线，且
D.
E,F,C三点不共线
【单选题】As soon as he entered the classroom, Paul ________ his coat.
A.
put up
B.
give up
C.
took off
D.
turn on
【单选题】He took his coat with him in case it .
A.
will rain
B.
should rain
C.
would rain
D.
rained
【简答题】A．He jumped into the river immediately. B．He took off his coat and jumped into the water. C．He dashed down the bridge to save the boy. D．He shouted out for help.
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