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【多选题】
在基因工程中,可用碱性磷酸酶()A.
防止DNA自身环化
B.
同多核苷酸激酶一起进行 DNA 的 5’ 末端标记
C.
制造3’突出末端
D.
以上说法都正确
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举一反三
【单选题】Jerry has been kept on doing morning exercise for along time. And now he becomes stronger than ever. He is no longer ______he use to be, when he often caught cold.
A.
that
B.
what .
C.
which
D.
whom
【简答题】What are the two speakers doing? [A] Sending an e-mail. [B] Doing spelling exercise. [C] Chatting online. [D] Talking on the phone.
【单选题】You should do more ___________ instead of sitting at the desk busy doing your _________.
A.
exercise; exercises
B.
exercises; exercise
C.
exercise; exercise
【单选题】李冶曾说:“吾平生著述,死后可尽燔去.独( )一书,虽九九小数,吾常精思致力焉,后世必有知者.庶可布广垂永乎。”
A.
《益古演段》
B.
《四元玉鉴》
C.
《数书九章》
D.
《测圆海镜》
【简答题】孟子在《公孙丑上》中说：“我知言，我善养吾()。”
【单选题】— Tomorrow is a holiday! Why are you doing your homework? —I am doing this exercise now so that I won't have ______ on Sunday.
A.
for
B.
them
C.
it
D.
to
【单选题】子曰：“君子不器。”——此句恰当的意思是()
A.
孔子说：“君子不能像器皿一样小家子气。”
B.
孔子说：“君子不是器物，可以随便装东西。”
C.
孔子说：“君子不能像器具那样，作用仅仅局限在某一方面。”
D.
孔子说：“君子不能像器具那样固定了形状，要么方要么圆。”
【单选题】What is the first thing before doing exercise?
A.
have a check-up
B.
do difficult exercise
C.
see a teacher
【单选题】_______ is good _______ your health. [ ]
A.
Do eye exercise, for
B.
Doing exercise, for
C.
Do eye exercises, to
D.
Doing eye exercises, to
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