题目内容

Today, Thanksgiving Day is______.

A. still a day to pray to God
B. a national holiday
C. a day of family reunion
D. all of the above

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mRNA链上三个核苷酸的改变才能使一种氨基酸变为另一种氨基酸代替。()

A. 正确
B. 错误

The police have caught the suspect and he immediately admitted______his boss on a rainy night seven years ago.

A. to kill
B. to have killed
C. having killed
D. have been killed

在消耗ATP的情况下，电子可从复合体Ⅳ流动到复合体Ⅰ。()

A. 正确
B. 错误

I would have gone to the hospital to visit him had it been possible, but I______fully occupied last week.

A. were
B. has been
C. have been
D. was