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【单选题】
2Passage- 19A.
B.
C.
D.
D
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【单选题】—-I’m very sorry. I haven’t brought you the pen you lent me yesterday. —-Forget it. You not return it to me as I have got an extra one.
A.
must
B.
need
C.
can
D.
should
【单选题】I don’t know the reason _____you were absent from the meeting, but I am sure that someone will tell me the reason____you haven’t told me.
A.
that; why
B.
because; which
C.
why; that
D.
of which; that
【简答题】I don’t know the reason _____ you were absent from the meeting, but I am sure that someone will tell me the reason _____ you haven’t told me. (5.0分)A. why; that B. that; why C. because; which D. of...
【单选题】从分子水平来说，自然选择淘汰一些稀少的等位基因，结果就是拥有这些等位基因的个体不能留下后代或留下较少的后代，这种自然选择的类型是：
A.
正选择（ positive selection ）
B.
负选择（ negative selection or purifying selection ）
C.
性选择
D.
都不是
【多选题】关于再生段跟踪标识失配（TIM）告警，下面哪些描述是正确的：（）。
A.
使用J0字节重复地发送段接入点标识符，收端能据此确认其与指定发送端处于持续连接状态。
B.
在同一个运营者的网络内该字节可为任意字符。
C.
在不同两个运营者的网络边界处要使设备收、发两端的J0字节相同——匹配。
D.
通过J0字节可使运营者提前发现和解决故障，缩短网络恢复时间。
【单选题】I don’t know the reason _____you were absent from the meeting, but I am sure that someone will tell me the reason____you haven’t told me.
A.
why; that
B.
that; why
C.
because; which
D.
of which; that
【简答题】自然选择的模型(类型)有哪几种?
【简答题】种群的自然选择类型有 、 和 三种。
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