If city noises ________ from increasing，people ________ shout to be heard even at the dinner table 20 years from now.
A. are not kept; will have to
B. are not kept; have to
C. do not keep; will have to
D. do not keep; have to
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—Have you got your test result?—Not yet.The papers ________.
A. are not correcting
B. have not corrected
C. are still being corrected
D. have already been corrected
The pen I ________ I ________ is on my desk，right under my nose.
A. think; lost
B. thought; had lost
C. think; had lost
D. thought; lost
热电偶的工作原理是效应，热电动势包括和两种，能产生热电动势的必要条件是。
减数分裂过程中同源染色体配对发生在第一次分裂的（）期。
A. 细线期
B. 终变期
C. 双线期
D. 偶线期
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