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【单选题】
利用重组基因技术制造的全新致病菌比一般的生物武器的危害性大，其原因是（） ①人类从来没有接触过这种致病菌 ②无药可医 ③只有某种易感基因的民族容易感染，而施放国的人却不易感染A.
①
B.
②
C.
②③
D.
①②
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举一反三
【简答题】H e stayed eight days in an open boat with no food, and he was still alive; his survival was a(n) ____.
【单选题】To be healthy, one must have at least _____ sleep every day.
A.
eight hours
B.
eight hour’s
C.
eight-hour’s
D.
eight hours’
【单选题】–How long has John _______? –For almost eight months.
A.
become an engineer
B.
stayed in Beijing
C.
joined the music club
D.
bought the CD player
【单选题】As a student, you need at least sleep a day.
A.
eight hours’s
B.
eight hour’s
C.
eight hours’
D.
eight hours
【单选题】—I am going to England for ______holiday next month. —Have a good trip ! [ ]
A.
a eight-day
B.
a eight-days
C.
an eight-days'
D.
an eight-day
【单选题】— Has Linda come back from Canada? — Yes. She ______ there for eight years. [ ]
A.
has stayed
B.
stays
C.
stayed
D.
had stayed
【单选题】Bill said they would have ___________ holiday.
A.
a eight-day
B.
an eight-day
C.
an eight-days
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