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【单选题】
一环状DNA分子，设其长度为1。已知某种限制性内切酶在该分子上有3个酶切位点，如图中箭头所指。如果该DNA分子在3个酶切位点上都被该酶切断，则会产生0．3、0．5、0．2三种不同长度的DNA片段。现有多个上述DNA分子，若在每个分子上至少有1个酶切位点被该酶切断，则从理论上讲，经该酶酶切后，这些DNA分子最多能产生长度不同的线状DNA的种类数是（）A.
4
B.
5
C.
6
D.
7
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【单选题】If Country A gives most-favored-nation (MFN) treatment to Country B. This means that the tariff schedules applicable to Country A's imports from Country B
A.
have lower tariff rates than the rates applicable to other countries to which Country A grants MFN treatment.
B.
have the same tariff rates as the rates applicable to other countries to which Country A grants MFN treatment.
C.
have lower tariff rates than the rates applicable to any other country sending goods to Country
D.
have tariff rates of zero percent.
【单选题】That country gives top priorities to developing chips for military purpose.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Country life gives him peace and quiet, which is ________ he can't enjoy while living in big cities.
A.
that
B.
why
C.
where
D.
what
【简答题】If you’re skeptical that sincerity and honesty can boost health, give a try and see what happens.
【简答题】Translate the following sentences from English to Chinese. A new study suggests that sincerity and honesty are keys to good health.
【单选题】Country life gives him peace and quietness , which is ______ he doesn't enjoy living in big cities. [ ]
A.
why
B.
when
C.
where
D.
that
【简答题】Britain is an island country and the surrounding sea gives the country a climate.
【简答题】电压的单位是( );在国际单位制中,电压的常用单位还有( )和( )。A. 安培(A); B. 伏特(V); C. 毫安 (mA); D. 微安(μA); E. 千伏(kV); F. 千安(kA); G. 毫伏(mV);
【简答题】Explain the following statements with at least 50 words. Illustrate your answer with evidence and reasoning. Sincerity, honesty, and a straightforward manner are more important than special talent or ...
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