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【多选题】
核小体的组成成分包括A.
200bp左右长度的DNA
B.
H1, H2A, H2B, H3和H4 各两分子组蛋白
C.
组蛋白
D.
组蛋白乙酰化和去乙酰化酶
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【单选题】He gave me the phone number in order ________ contact him when we are in need of help. [ ]
A.
me to
B.
of me to
C.
for me to
D.
that I
【单选题】He gave me the phone number in order ______ contact him when we are in need of help.
A.
to
B.
of me to
C.
for me to
D.
that I
【简答题】冷冻机油在制冷系统中起到()、()、()、清洁和消声减振等作用。
【简答题】冷冻机油在制冷系统中起到润滑、冷却、密封、清洁和（）的作用。
【单选题】The teacher asked me to read aloud all the students could hear me.
A.
so that
B.
for
C.
because
D.
in order to
【单选题】— Excuse me, can I take your order? —_____________ .
A.
Yes, I’d like a bowl of duck soup
B.
I’d like a bowl of duck soup
C.
Give me a bowl of duck soup
D.
Take your order
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