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【单选题】
弗来明发现青霉素是由于观察到在产霉菌菌落周围不见有革兰阳性细菌生长,而再深入研究创造奇迹的。这是人类首次观察到的微生之间的。A.
捕 食 关 系
B.
寄 生 关 系
C.
非专一性拮抗关系
D.
专一性拮抗关系
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】网络机房利用( )将多台计算机及相关网络设备互联而成,为实现建构协作化学习创造了良好技术基础。
A.
声--电转换
B.
网络和多媒体技术
C.
信号处理
D.
信号放大
【单选题】—Why _________ your brother like baseball? —Because he thinks it is interesting．A．is
A.
7． —Why _________ your brother like baseball? —Because he thinks it is interesting． A．is
B.
are
C.
do
D.
does
【简答题】Write briefly about why Sylvia is not promoted. 1) According to the woman, it is because
【单选题】Why does Sylvia decide not to share the secret of the white heron with the man?
A.
Because she realizes that the bird is an integral part of the nature, with which she shares a close bond.
B.
Because she realizes that white heron verges on extinction and it's her responsibility to protect it.
C.
Because the man is too assertive and aggressive to be trusted.
D.
Because the man does not return her affection.
【单选题】Why does Sylvia decide not to share the secret of the white heron with the man?
A.
Because she realizes that the white heron verges on extinction and it’s her responsibility to protect it.
B.
Because the man is too assertive and aggressive to be trusted.
C.
Because she realizes that the bird is an integral part of the nature, with which she shares a close bond.
D.
Because the man does not return her affection.
【单选题】Why does Sylvia refuse to employ women of childbearing age?
A.
Because her business is a man-dominated company.
B.
Because her business needs full-time workers.
C.
Because her business can’t sustain a year’s maternity leave.
D.
Because her business can’t sustain the maternity cost.
【单选题】I don’t know ____ everyone in my class thinks I’m funny.
A.
why is it that
B.
why it is that
C.
who is it which
D.
who it is that
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