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【简答题】
常见的菌种保藏方法有( )、( )和( )等,其中( )方法保藏菌种的时间最长。
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2
B.
3
C.
4
D.
5
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【单选题】Choose the best answer to complete each of the sentences. It was already 11 o'clock in the evening ______ they arrived at the hotel.
A.
when
B.
while
C.
once
D.
since
【单选题】It was already 11 o'clock in the evening ______ they arrived at the hotel.
A.
when
B.
while
C.
once
D.
since
【简答题】Complete the following passage with the words in the box. Each can be used only once. A. moved B. the other C. another D. tired E. because Once, a king had a new road built. The king ha...
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【简答题】Once they arrived at their , they met with other groups of young people and had one long party.