题目内容

This work must be done within the time.

A. give
B. giving
C. gave
D. given

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Along the roads, there are beautiful flowers that delight travelers'.

A. eye
B. eyes
C. sight
D. seeing

Living creatures are living in harmony the surroundings.

A. within
B. with
C. to
D. of

The mornings in the forest throb with the dawn chorus of scores of bird voices. Which of the following expessions has the same meaning with the underlined part?

A. are covered with
B. vibrate with
C. deal with
D. are connected with

体内硫酸根主要来自哪种氨基酸

A. Met
B. Cys
C. Trp
D. Phe