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【单选题】
胚胎干细胞具有的特征是A.
未分化的多能性细胞,可分化为外、中、内三种胚层及胚外组织
B.
具有分化为内胚层的潜能,但不具有分化为外胚层的潜能
C.
具有分化为中胚层的潜能,但不具有分化为内胚层的潜能
D.
具有分化为外胚层的潜能,但不具有分化为内胚层的潜能
E.
具有分化为后续发育个体的任何组织细胞的潜能
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反馈参考答案：
举一反三
【单选题】Questions 20-22 will be based on the passages you have just heard
A.
make people come up with rough numbers and estimates
B.
make people use less energy and generate fewer gases
C.
help scientists figure out what the future will bring
D.
encourage companies to emit more carbon dioxide
【单选题】Questions 20-22 will be based on the passages you have just heard
A.
it costs no more than the normal construction
B.
it does a poor job of facing extreme weather
C.
it holds up much better to extreme weather
D.
it impacts weather changes and the economy
【简答题】有些磷脂和糖脂的骨架不是甘油而是(),因此它们又被称为()。
【单选题】—Every now and then I get hungry for Chinese food. Let’s dine out tonight. —Forget it. My money_______.
A.
has run short
B.
is running short
C.
runs short
D.
was running short
【多选题】关于身体活动影响能量消耗的叙述正确的包括
A.
肌肉越发达者，活动时消耗能量越多
B.
工作越熟练者，消耗能量越多
C.
体重越重者，做相同的运动所消耗的能量也越多
D.
做家务与游泳消耗的能量相当
E.
慢跑消耗的能量多于快走
【简答题】备课就是要密切围绕新的生物课程标准提出的目标来设计教学的各个环节,并保证“目标、策略、评价”的__________________________________。
【单选题】The coming of the railways in the 1830s _____ our society and econo
A.
transferred
B.
transformed
C.
transmitted
D.
transported
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