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【單選題】
細(xì)胞中的多種無(wú)機(jī)鹽主要以離子形式存在，用培養(yǎng)液培養(yǎng)單細(xì)胞小球藻時(shí)發(fā)現(xiàn)：若向培養(yǎng)液中導(dǎo)入臭氧，小球藻中只有K+立即外流，若將溶液中臭氧除去，則K+外流立即逆轉(zhuǎn)，細(xì)胞中的K+很快恢復(fù)到原有水平。以上結(jié)果不能證明（ ）
A.
臭氧可改變細(xì)胞膜的通透性
B.
臭氧對(duì)膜物質(zhì)的作用具有選擇性
C.
臭氧對(duì)膜的影響是可恢復(fù)的
D.
臭氧對(duì)小球藻的細(xì)胞呼吸有抑制作用
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舉報(bào)參考答案：
舉一反三
【單選題】Where can you find a gift idea to improve your mother’s sleep?
A.
In Gift No. 1.
B.
In Gift No. 2.
C.
In Gift No. 3.
D.
In Gift No. 4.
【單選題】The underlined expression cutting edge in Paragraph 3 is closest in meaning to ______.
A.
advanced technique
B.
sharpening tool
C.
effective rule
D.
dividing line
【單選題】Buying gifts from Presents for Purpose allows mothers to________.
A.
enjoy good sleep
B.
give others help
C.
get extra support
D.
be well-organized
【單選題】What are you advised to do for your mother at doctor's visits?
A.
Be with her.
B.
Buy medicine.
C.
Take notes.
D.
Give her gifts.
【單選題】Why was Jennifer watched in an online exam?
A.
To correct her typing mistakes.
B.
To find her secrets in the room.
C.
To pr her form slowing down.
D.
To keep her from dishonest behaviors.
相關(guān)題目：
【單選題】Where can you find a gift idea to improve your mother’s sleep?
A.
In Gift No. 1.
B.
In Gift No. 2.
C.
In Gift No. 3.
D.
In Gift No. 4.
【單選題】The underlined expression cutting edge in Paragraph 3 is closest in meaning to ______.
A.
advanced technique
B.
sharpening tool
C.
effective rule
D.
dividing line
【單選題】Buying gifts from Presents for Purpose allows mothers to________.
A.
enjoy good sleep
B.
give others help
C.
get extra support
D.
be well-organized
【單選題】What are you advised to do for your mother at doctor's visits?
A.
Be with her.
B.
Buy medicine.
C.
Take notes.
D.
Give her gifts.
【單選題】Why was Jennifer watched in an online exam?
A.
To correct her typing mistakes.
B.
To find her secrets in the room.
C.
To pr her form slowing down.
D.
To keep her from dishonest behaviors.
參考解析：
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