－How is your recent trip to Taiyuan？－－I’ve never had____one before.
A.the most pleasant
B.a least pleasant
C.a pleasant
D.a more pleasant
_____the production cost is high,we think that our price was not on the high side.
A.Consider
B.Considering
C.Considered
D.Considerable
下列哪个不是Lac操纵子的组成部分（）。
A.Z.Y、A基因
B.启动序列
C.操纵序列
D.TATA盒
E.CAP结合位点
We have made it clear that the packing must be____ to withstand rough handling.
A.enough
B.enough strongly
C.strong enough
D.strongly enough
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