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【单选题】
细胞内有机小分子的分子量在100~1000范围内,是组成生物大分子的亚单位。下列关于有机小分子的叙述,哪项是错误的A.
核苷酸是RNA和DNA的基本结构单位
B.
单糖、脂肪酸、氨基酸和DNA是组成生物大分子的主要有机小分子
C.
氨基酸的特点是同时携带羧基和氨基
D.
糖的化学组成为(CH 2 O)n,又称碳水化合物
E.
脂肪酸是细胞膜的重要组成成分
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【多选题】单相桥式整流电路:
A.
用两个二极管组成
B.
用四个二极管接成电桥形式
C.
与半波整流电路比脉动成份减少
D.
输出电压的平均值比半波时增加了一倍
E.
输出电压的平均值和半波时一样
【单选题】---Which house do you think is Uncle Lee’s? ---I think the one _________ door faces south is his.
A.
whose
B.
which
C.
that
【单选题】—What do you think of this film? —It's ______ than the last one, I think. [ ]
A.
interesting
B.
interested
C.
more interesting
D.
more interested
【单选题】--This is ______ useful book, I think.-- So it is, and it's ______ unusual one.
A.
a a
B.
a an
C.
an an
【简答题】桥式整流电路的输出波形脉动比半波整流电路 。
【单选题】I haven't read ____ of his books, but judging from the one I have read I think he's a very promising writer. [ ]
A.
any
B.
none
C.
both
D.
either
【单选题】— What do you think of the book A Child's Garden of Verses? — Wonderful. It's ______ one I have ever read. [ ]
A.
a better
B.
a great
C.
the best
D.
a good
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