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【单选题】
杂交种品种的育种特点之一是A.
A群体遗传组成同质、个体纯合
B.
B 群体遗传组成异质、个体杂合
C.
C群体遗传组成同质、个体杂合
D.
D 群体遗传组成同质、个体杂合
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【简答题】vt. attract sb. and make them like you, sometimes in order to make them do sth. for you 迷住;吸引n. [C, U] a special quality sb. or sth. has that makes people like them, feel attracted to them, or be easi...
【单选题】Dolly wants to cycle round the world and she is really keen the idea．
A.
on
B.
for
C.
at
D.
with
【单选题】—It’s amazing that an Australian girl sailed round the world alone in about 200 days. —That’s an inspiring story. Her courage is really _______.
A.
unbearable
B.
independent
C.
admirable
D.
enthusiastic
【单选题】B News 1 Have you ever thought of being able to fly round the world in a few hours though it is about 40，000 kilometres? One day， maybe you can． Last Saturday， the American X-43A airplane made its fir...
A.
people can't go round the earth in a few hours
B.
the American X-43A airplane traveled round the earth in a few hours
C.
the American X-43A airplane is the fastest one in the world
D.
only Americans can make such a fast plane
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