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【判断题】
设函数f(x)在x0处的极限存在,则函数f(x)在x0点的左右极限存在且相等A.
正确
B.
错误
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举一反三
【简答题】如图为菜豆种子结构图，请据图回答： （1）写出图示各结构名称： ①______②______③______④______⑤______． （2）菜豆种子储藏营养物质的结构是[______]______． （3）图中①②③④构成了______．保护种子内部结构的是[______]______．
【单选题】Jane takes delight ______ reading novels and watching TV when she stays at home.
A.
in
B.
into
C.
from
D.
By
【单选题】Marry _____ as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
A.
has served
B.
had served
C.
has been served
D.
served
【单选题】Lily always stays at home. She never goes abroad ?
A.
is she
B.
isn’t she
C.
does she
D.
doesn’t she
【单选题】在糖酵解过程中NADH+H+的去路是
A.
使丙酮酸还原成乳酸
B.
经∝-磷酸甘油穿梭系统进入线粒体氧化
C.
经苹果酸穿梭系统进入线粒体氧化
D.
2-磷酸甘油酸还原为3-磷酸甘油醛
E.
以上都对
【单选题】在糖酵解过程中NADH+H+的去路是
A.
使丙酮酸还原为乳酸
B.
经α-磷酸甘油穿梭系统进入线粒体氧化
C.
经苹果酸穿梭系统进入线粒体氧化
D.
2-磷酸甘油酸还原为3-磷酸甘油醛
E.
以上都对
【简答题】A．Her roommate stays awake all night. B．She needs a quieter place. C．She wants to save money to buy a piano. D．The present apartment is too expensive.
【单选题】It's ___ to see her go out; she always stays at home.
A.
often
B.
hardly
C.
rare
D.
never
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