皮皮学，免费搜题
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【单选题】
在Windows默认环境中,下列4组键中,系统默认的中英文输入切换键是:A.
Ctrl+Alt
B.
Ctrl+Shift
C.
Ctrl+空格
D.
Ctrl+Tab
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Mrs. Smith locked both the front and the back doors before she went to bed ______ that someone might steal into the house at night.
A.
so
B.
for fear
C.
unless
D.
on condition
【简答题】番茄红色果皮(R)对黄色果皮(r)是显性，如果把结红色果皮番茄的纯种番茄花粉授到结黄色果皮番茄的番茄柱头上，请说出黄色果皮番茄所结果的颜色，并用所学过的生物学知识解释。
【单选题】番茄果皮红色(R)对黄色(r)为显性，若将纯种红色番茄的花粉授到黄色番茄的柱头上，则黄色番茄的植株上所结番茄的果皮将是 [ ]
A.
黄色，基因型为rr
B.
红色，基因型为RR
C.
红色，基因型为Rr
D.
介于红、黄之间，基因型为Rr
【简答题】番茄粉
【单选题】The customer didn't choose _____ of the coats and went away without looking at a third one. [ ]
A.
both
B.
all
C.
any
D.
either
【单选题】______ went to see the film yesterday.
A.
Every of them
B.
Both they
C.
Nobody of them
D.
Not all of them
【单选题】Lily Sam likes popular songs, so they went to Zhou Jielun’s concert together last night.
A.
Both, and
B.
Either, or
C.
Not only, but also
D.
Neither, nor
【单选题】The man didn’t choose __ of the suits and went away without looking at ___ third one.
A.
both; a
B.
any; the
C.
neither; the
D.
either; a
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