题目内容

There were no tickets () for Sunday's performance.

A. possible
B. probable
C. available
D. feasible

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The storm caused severe damage（）

A. physical
B. accidental
C. serious
D. enviromental

A new system of quality control was brought in to overcome the defects in the firm's products.

A. invested
B. introduced
C. installed
D. insisted

But from the start of their experiments, the Wright brothers found that they needed money to pay () their research.

A. back
B. down
C. for
D. off

mRNA上的四种核苷酸能组成多少种密码子

A. 4
B. 16
C. 61
D. 64
E. 81