【单选题】【消耗次数：1】
胚胎植入是在（）
①
卵裂早期
②
桑椹胚时期
③
胚泡时期
④
胚盘分化时期
⑤
胚体形成时期
参考答案：
复制
纠错
相关题目
随机题目
【单选题】
In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover（火星控测飞行器）, ____ a new milestone（里程碑）in the history of mankind.
①
it marked
②
marking
③
marked
④
to mark
【单选题】
The dog, ____, will be made a good watchdog.
①
to train properly
②
being trained properly
③
properly to train
④
trained properly
【单选题】
The old farmer, ____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.
①
supporting
②
having supported
③
being supported by
④
being supported
【单选题】
____ the front door ____, he had to enter the room through the back door.
①
Seen; painted
②
Seeing; painted
③
Being seen; being painted
④
Seeing; being painted
【单选题】
When he was a boy, he used to go there and watch ____.
①
to repair bicycles
②
bicycles to be repaired
③
bicycles being repaired
④
repairing bicycles
【单选题】
—Have you considered ____ your job as a teacher? —Yes. I like the job because a teacher is often considered a gardener.
①
?to change; to be
②
?to change; being
③
?changing; being
④
?changing; to be
【单选题】
Every one of you is looking forward ___ getting a good result. Better think carefully before writing down your answers. Wish you success!
①
?on
②
? in
③
?to
④
? of
【单选题】
— I hear ___ your grandpa ___ your grandma like watching Min Opera. — Right, just as many old people do in Fuzhou.
①
?both; and
②
?either; or
③
neither; nor
④
?not only; but also
【单选题】
Many teenagers have hobbies. But sometimes these hobbies can get ___ of schoolwork.
①
?on the way
②
?in the way
③
? by the way
④
?out of the way