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【单选题】
下列对应 if 、 else 、 elseif 标签描述错误的是A.
if 标签是一个双标签，必须有开始有结束
B.
elseif 是一个双标签，必须有开始有结束
C.
else 是一个单标签
D.
condition 属性用来设置判断条件
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举一反三
【单选题】Which of the following is a beneficial activity of microorganisms?
A.
Some microorganisms are used as food for humans.
B.
Some microorganisms use carbon dioxide.
C.
Some microorganisms provide nitrogen for plant growth.
D.
d.Some microorganisms are used in sewage treatment processes.
E.
all of the above
【单选题】—Do you think I could borrow your dictionary? —______.
A.
Yes, you may borrow
B.
Yes, you could
C.
Yes, help yourself
D.
Yes, go on
【简答题】An is a substance produced by microorganisms that inhibits or kills other microorganisms
【单选题】— Alice told me you called yesterday. — Yes, I had a problem with Jane, ___________I thought you could help me with, but you were not in.
A.
who
B.
whom
C.
that
D.
which
【单选题】Which of the following descriptions about the relationship between microorganisms and human is WRONG?
A.
all microorganisms cause diseases in human
B.
only a few microorganisms are always pathogenic
C.
many microorganisms are potentially pathogenic
D.
most microorganisms are never pathogenic
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