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【单选题】
末端转移酶是合成酶类A.
(a) 作用时不需要模板
B.
在 Ca 2+ 的存在下，可以在突出的 3 ，末端延长 DNA 链
C.
在 Ca 2+ 的存在下，可以在隐蔽的 3 ，末端延长 DNA 链
D.
上述说法都是正确的
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举一反三
【单选题】The music _____ she is dancing sounds beautiful. [ ]
A.
by which
B.
to which
C.
with which
D.
at which
【简答题】The speech sounds which are in complementary distribution are definitely allophones of the same phoneme.
【单选题】听力原文：Which sounds better, a concert a or a movie? (A) That sounds like a great idea. (B) I haven't seen a film for a while. Let's do that. (C) It's not certain whether he is coming. (33)
A.
B.
【单选题】After teaching sounds， a teacher makes a test that aims to find out which sounds students are not able to pronounce. This test belongs to_________.
A.
aptitude test
B.
proficiency test
C.
achievement test
D.
diagnostic test
【简答题】发现前方道路堵塞，正确的做法是什么？
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