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【单选题】
F4自交收获的种子及其种植后长出来的植株叫( )。A.
杂种二代
B.
杂种三代
C.
杂种四代
D.
杂种五代
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皮皮学刷刷变学霸
举一反三
【简答题】正式场合着重的“TPO”原则是指:时间原则、 __________ 、___________。
【单选题】In Washington D. C. , 1600 Pennsylvania Avenue is a very special address. It is the address of the White House, the home of the President of the United States. Originally the White House was gray and ...
A.
because a French engineer was invited to design it
B.
because President George Washington liked to live in it
C.
because the British invaders lived in it in 1812—1814
D.
because it was to be the nation's capital city