题目内容

何谓生物转化？简述其类型及意义。

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_______ “hello”, he reached out his han

A. Said
B. Saying
C. To say
D. Say

There is “u” and “s” in the word “us”.

A. a…a
B. a…an
C. an…a
D. an…an

A.andB.butC.as well asD.also

A. and
B. but
C. as well as
D. also

The leaves of many trees turn ______ in autumn.

A. to red
B. red
C. to be red
D. into red