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【单选题】
关于终末细支气管的描述错误的是:A.
管壁有环形的平滑肌层
B.
上无杯状细胞
C.
管壁有肺泡开口，可进行气体交换
D.
管壁无腺体和软骨
E.
上层纤毛柱状
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举一反三
【单选题】—Let me help you carry the box. —No, thanks. It’s big, __________ there is nothing in it.
A.
and
B.
so
C.
but
D.
Because
【单选题】Which of the following inferences CANNOT be made from the information in the first paragraph?
A.
Calhoun's experiment is still considered important today.
B.
Overpopulation causes pathological behavior. in rat populations.
C.
Stress does not occur in rat communities unless there is overcrowding.
D.
Calhoun had experimented with rats before.
【单选题】—This box is too heavy for me to carry upstairs.—( )( ).
A.
You may ask for help.
B.
Let me give you a hand.
C.
Please do me a favor.
D.
I'd come to help.
【单选题】Which of the following can be inferred about the experiment described in the first paragraph?
A.
Researchers had difficulty verifying the existence of electroreceptors in the anteater because electroreceptors respond to such a narrow range of electrical field strengths.
B.
Researchers found that the level of nervous activity in the anteater’s brain increased dramatically as the strength of the electrical stimulus was increased.
C.
Researchers found that some areas of the anteater’s snout were not sensitive to a weak electrical stimulus.
D.
Researchers found that the anteater’s tactile receptors were more easily excited by a strong electrical stimulus than were the electro receptors..
E.
Researchers tested small areas of the anteater’s snout in order to ensure that only electroreceptors were responding to the stimulus.
【单选题】—Let me help you to carry the box. —No, thanks. I can do it by __________. [ ]
A.
me
B.
my
C.
mine
D.
myself
【简答题】钢结构材料的强度检测主要有三种方法: 、 、和 。
【单选题】—Let me help you carry those books. —____________. [ ]
A.
That's very kind of you
B.
No,I can
C.
No ,you can't
D.
Yes , please
【单选题】---Let me help you carry the box. ---No, thanks. It’s big, __________ there is nothing in it.
A.
and
B.
so
C.
but
D.
because
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