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【简答题】
读长江水系图，然后完成下列要求： （1）长江中游和下游的分界城市①是___________，入海口处的城市是②___________。 （2）长江是我国第一大河，流经我国三个阶梯，落差___________（大或小），有“水能宝库”之称；长江航运价值高，有“___________”之称。 （3）长江干支流上修建了多座水电站，最大的水电站③是___________水利枢纽工程，它以为首要目标是 。 （4）由于长江不同河段特征不同，所以治理措施也不同。（选择填空） 上游河段急流峡谷众多易引发洪水，故需___________；中游河道水流不一场，故需___________；下游江阔水深水量很大，故需___________。（A．加固大堤保障安全；B．筑坝拦水，植树造林；C．裁弯取直）
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举一反三
【单选题】This new type of TV set is very thin, and it is than a one-hundred-page book.
A.
less
B.
not thinner
C.
no thicker
D.
no thinner
【单选题】Chromatin in which of the following states is the most euchromatic?
A.
in a Barr body
B.
in the centromere
C.
in a transcribed gene during G1 phase
D.
in a silenced gene during M phase
E.
in a sperm nucleus
【单选题】She couldn’t decide which restaurant _______.
A.
to have lunch
B.
to eat
C.
to eat at
【单选题】About the chromatin, which is not right?________
A.
Chromatin consists of DNA and RNA only.
B.
Histone proteins are alkalic and postively charged.
C.
The nucleosome core protein consists of eight histone subunits.
D.
H1 histone is not found in the core protein.
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